Finding the Fourth Proportional to 102,114.72, 140,916.96 and 57,402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,114.72 : 140,916.96 = 57,402.72 : x
2. Step 2: Convert to fraction form
   102,114.72/140,916.96 = 57,402.72/x
3. Step 3: Cross multiply
   102,114.72x = 140,916.96 × 57,402.72
4. Step 4: Simplify right side
   102,114.72x = 8,089,016,798.13
5. Step 5: Solve for x
   x = 8,089,016,798.13/102,114.72
6. Step 6: Final answer
   x = 79,214.99