Finding the Fourth Proportional to 99,505.32, 137,309.76 and 56,479.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,505.32 : 137,309.76 = 56,479.76 : x
2. Step 2: Convert to fraction form
   99,505.32/137,309.76 = 56,479.76/x
3. Step 3: Cross multiply
   99,505.32x = 137,309.76 × 56,479.76
4. Step 4: Simplify right side
   99,505.32x = 7,755,222,290.46
5. Step 5: Solve for x
   x = 7,755,222,290.46/99,505.32
6. Step 6: Final answer
   x = 77,937.77