Finding the Fourth Proportional to 861,029,488.32, 1,291,225,362.72 and 278,612,667.52

Step by Step Solution

1. Step 1: Write the proportion equation
   861,029,488.32 : 1,291,225,362.72 = 278,612,667.52 : x
2. Step 2: Convert to fraction form
   861,029,488.32/1,291,225,362.72 = 278,612,667.52/x
3. Step 3: Cross multiply
   861,029,488.32x = 1,291,225,362.72 × 278,612,667.52
4. Step 4: Simplify right side
   861,029,488.32x = 359,751,742,676,898,752
5. Step 5: Solve for x
   x = 359,751,742,676,898,752/861,029,488.32
6. Step 6: Final answer
   x = 417,815,821.13