Finding the Fourth Proportional to 105,601.86, 145,730.69 and 57,203.90

Step by Step Solution

1. Step 1: Write the proportion equation
   105,601.86 : 145,730.69 = 57,203.90 : x
2. Step 2: Convert to fraction form
   105,601.86/145,730.69 = 57,203.90/x
3. Step 3: Cross multiply
   105,601.86x = 145,730.69 × 57,203.90
4. Step 4: Simplify right side
   105,601.86x = 8,336,363,817.69
5. Step 5: Solve for x
   x = 8,336,363,817.69/105,601.86
6. Step 6: Final answer
   x = 78,941.45