Finding the Fourth Proportional to 102,116.72, 140,919.72 and 57,404.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,116.72 : 140,919.72 = 57,404.72 : x
2. Step 2: Convert to fraction form
   102,116.72/140,919.72 = 57,404.72/x
3. Step 3: Cross multiply
   102,116.72x = 140,919.72 × 57,404.72
4. Step 4: Simplify right side
   102,116.72x = 8,089,457,069.08
5. Step 5: Solve for x
   x = 8,089,457,069.08/102,116.72
6. Step 6: Final answer
   x = 79,217.75