Finding the Fourth Proportional to 105,397.98, 145,446.12 and 57,650.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,397.98 : 145,446.12 = 57,650.30 : x
2. Step 2: Convert to fraction form
   105,397.98/145,446.12 = 57,650.30/x
3. Step 3: Cross multiply
   105,397.98x = 145,446.12 × 57,650.30
4. Step 4: Simplify right side
   105,397.98x = 8,385,011,724.61
5. Step 5: Solve for x
   x = 8,385,011,724.61/105,397.98
6. Step 6: Final answer
   x = 79,555.72