Finding the Fourth Proportional to 105,677.98, 145,842.39 and 57,931.45

Step by Step Solution

1. Step 1: Write the proportion equation
   105,677.98 : 145,842.39 = 57,931.45 : x
2. Step 2: Convert to fraction form
   105,677.98/145,842.39 = 57,931.45/x
3. Step 3: Cross multiply
   105,677.98x = 145,842.39 × 57,931.45
4. Step 4: Simplify right side
   105,677.98x = 8,448,861,124.17
5. Step 5: Solve for x
   x = 8,448,861,124.17/105,677.98
6. Step 6: Final answer
   x = 79,949.12