Finding the Fourth Proportional to 102,120.72, 140,925.24 and 57,408.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,120.72 : 140,925.24 = 57,408.72 : x
2. Step 2: Convert to fraction form
   102,120.72/140,925.24 = 57,408.72/x
3. Step 3: Cross multiply
   102,120.72x = 140,925.24 × 57,408.72
4. Step 4: Simplify right side
   102,120.72x = 8,090,337,644.09
5. Step 5: Solve for x
   x = 8,090,337,644.09/102,120.72
6. Step 6: Final answer
   x = 79,223.27