Finding the Fourth Proportional to 99,504.32, 137,308.38 and 56,478.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99,504.32 : 137,308.38 = 56,478.76 : x
2. Step 2: Convert to fraction form
   99,504.32/137,308.38 = 56,478.76/x
3. Step 3: Cross multiply
   99,504.32x = 137,308.38 × 56,478.76
4. Step 4: Simplify right side
   99,504.32x = 7,755,007,040.01
5. Step 5: Solve for x
   x = 7,755,007,040.01/99,504.32
6. Step 6: Final answer
   x = 77,936.39