Finding the Fourth Proportional to 288,991.38, 433,443.33 and 78,645.72

Step by Step Solution

1. Step 1: Write the proportion equation
   288,991.38 : 433,443.33 = 78,645.72 : x
2. Step 2: Convert to fraction form
   288,991.38/433,443.33 = 78,645.72/x
3. Step 3: Cross multiply
   288,991.38x = 433,443.33 × 78,645.72
4. Step 4: Simplify right side
   288,991.38x = 34,088,462,767.05
5. Step 5: Solve for x
   x = 34,088,462,767.05/288,991.38
6. Step 6: Final answer
   x = 117,956.68