Finding the Fourth Proportional to 105,168.78, 145,145.61 and 59,857.74

Step by Step Solution

1. Step 1: Write the proportion equation
   105,168.78 : 145,145.61 = 59,857.74 : x
2. Step 2: Convert to fraction form
   105,168.78/145,145.61 = 59,857.74/x
3. Step 3: Cross multiply
   105,168.78x = 145,145.61 × 59,857.74
4. Step 4: Simplify right side
   105,168.78x = 8,688,088,185.52
5. Step 5: Solve for x
   x = 8,688,088,185.52/105,168.78
6. Step 6: Final answer
   x = 82,610.91