Finding the Fourth Proportional to 99,388.38, 137,155.91 and 56,971.52

Step by Step Solution

1. Step 1: Write the proportion equation
   99,388.38 : 137,155.91 = 56,971.52 : x
2. Step 2: Convert to fraction form
   99,388.38/137,155.91 = 56,971.52/x
3. Step 3: Cross multiply
   99,388.38x = 137,155.91 × 56,971.52
4. Step 4: Simplify right side
   99,388.38x = 7,813,979,699.05
5. Step 5: Solve for x
   x = 7,813,979,699.05/99,388.38
6. Step 6: Final answer
   x = 78,620.66