Finding the Fourth Proportional to 102,124.72, 140,930.76 and 57,412.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,124.72 : 140,930.76 = 57,412.72 : x
2. Step 2: Convert to fraction form
   102,124.72/140,930.76 = 57,412.72/x
3. Step 3: Cross multiply
   102,124.72x = 140,930.76 × 57,412.72
4. Step 4: Simplify right side
   102,124.72x = 8,091,218,263.27
5. Step 5: Solve for x
   x = 8,091,218,263.27/102,124.72
6. Step 6: Final answer
   x = 79,228.79