Finding the Fourth Proportional to 105,646.83, 145,793.78 and 57,899.16

Step by Step Solution

1. Step 1: Write the proportion equation
   105,646.83 : 145,793.78 = 57,899.16 : x
2. Step 2: Convert to fraction form
   105,646.83/145,793.78 = 57,899.16/x
3. Step 3: Cross multiply
   105,646.83x = 145,793.78 × 57,899.16
4. Step 4: Simplify right side
   105,646.83x = 8,441,337,105.73
5. Step 5: Solve for x
   x = 8,441,337,105.73/105,646.83
6. Step 6: Final answer
   x = 79,901.47