Finding the Fourth Proportional to 288,876.69, 433,417.59 and 128,938.06

Step by Step Solution

1. Step 1: Write the proportion equation
   288,876.69 : 433,417.59 = 128,938.06 : x
2. Step 2: Convert to fraction form
   288,876.69/433,417.59 = 128,938.06/x
3. Step 3: Cross multiply
   288,876.69x = 433,417.59 × 128,938.06
4. Step 4: Simplify right side
   288,876.69x = 55,884,023,224.48
5. Step 5: Solve for x
   x = 55,884,023,224.48/288,876.69
6. Step 6: Final answer
   x = 193,452.86