Finding the Fourth Proportional to 105,522.72, 145,615.75 and 57,766.87

Step by Step Solution

1. Step 1: Write the proportion equation
   105,522.72 : 145,615.75 = 57,766.87 : x
2. Step 2: Convert to fraction form
   105,522.72/145,615.75 = 57,766.87/x
3. Step 3: Cross multiply
   105,522.72x = 145,615.75 × 57,766.87
4. Step 4: Simplify right side
   105,522.72x = 8,411,766,100.20
5. Step 5: Solve for x
   x = 8,411,766,100.20/105,522.72
6. Step 6: Final answer
   x = 79,715.21