Finding the Fourth Proportional to 105,494.92, 145,570.10 and 84,039.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,494.92 : 145,570.10 = 84,039.30 : x
2. Step 2: Convert to fraction form
   105,494.92/145,570.10 = 84,039.30/x
3. Step 3: Cross multiply
   105,494.92x = 145,570.10 × 84,039.30
4. Step 4: Simplify right side
   105,494.92x = 12,233,608,884.73
5. Step 5: Solve for x
   x = 12,233,608,884.73/105,494.92
6. Step 6: Final answer
   x = 115,963.96