Finding the Fourth Proportional to 105,168.85, 145,132.92 and 57,422.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,168.85 : 145,132.92 = 57,422.18 : x
2. Step 2: Convert to fraction form
   105,168.85/145,132.92 = 57,422.18/x
3. Step 3: Cross multiply
   105,168.85x = 145,132.92 × 57,422.18
4. Step 4: Simplify right side
   105,168.85x = 8,333,849,019.00
5. Step 5: Solve for x
   x = 8,333,849,019.00/105,168.85
6. Step 6: Final answer
   x = 79,242.56