Finding the Fourth Proportional to 105,496.43, 145,585.15 and 57,749.86

Step by Step Solution

1. Step 1: Write the proportion equation
   105,496.43 : 145,585.15 = 57,749.86 : x
2. Step 2: Convert to fraction form
   105,496.43/145,585.15 = 57,749.86/x
3. Step 3: Cross multiply
   105,496.43x = 145,585.15 × 57,749.86
4. Step 4: Simplify right side
   105,496.43x = 8,407,522,068.19
5. Step 5: Solve for x
   x = 8,407,522,068.19/105,496.43
6. Step 6: Final answer
   x = 79,694.85