Finding the Fourth Proportional to 105,404.08, 145,455.72 and 57,657.01

Step by Step Solution

1. Step 1: Write the proportion equation
   105,404.08 : 145,455.72 = 57,657.01 : x
2. Step 2: Convert to fraction form
   105,404.08/145,455.72 = 57,657.01/x
3. Step 3: Cross multiply
   105,404.08x = 145,455.72 × 57,657.01
4. Step 4: Simplify right side
   105,404.08x = 8,386,541,902.60
5. Step 5: Solve for x
   x = 8,386,541,902.60/105,404.08
6. Step 6: Final answer
   x = 79,565.63