Finding the Fourth Proportional to 105,316.59, 145,336.92 and 57,570.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,316.59 : 145,336.92 = 57,570.15 : x
2. Step 2: Convert to fraction form
   105,316.59/145,336.92 = 57,570.15/x
3. Step 3: Cross multiply
   105,316.59x = 145,336.92 × 57,570.15
4. Step 4: Simplify right side
   105,316.59x = 8,367,068,284.94
5. Step 5: Solve for x
   x = 8,367,068,284.94/105,316.59
6. Step 6: Final answer
   x = 79,446.82