Finding the Fourth Proportional to 99,388.22, 137,124.90 and 56,938.55

Step by Step Solution

1. Step 1: Write the proportion equation
   99,388.22 : 137,124.90 = 56,938.55 : x
2. Step 2: Convert to fraction form
   99,388.22/137,124.90 = 56,938.55/x
3. Step 3: Cross multiply
   99,388.22x = 137,124.90 × 56,938.55
4. Step 4: Simplify right side
   99,388.22x = 7,807,692,289.27
5. Step 5: Solve for x
   x = 7,807,692,289.27/99,388.22
6. Step 6: Final answer
   x = 78,557.53