Finding the Fourth Proportional to 105,426.52, 145,488.50 and 57,679.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,426.52 : 145,488.50 = 57,679.90 : x
2. Step 2: Convert to fraction form
   105,426.52/145,488.50 = 57,679.90/x
3. Step 3: Cross multiply
   105,426.52x = 145,488.50 × 57,679.90
4. Step 4: Simplify right side
   105,426.52x = 8,391,762,131.15
5. Step 5: Solve for x
   x = 8,391,762,131.15/105,426.52
6. Step 6: Final answer
   x = 79,598.21