Finding the Fourth Proportional to 105,485.76, 145,557.54 and 84,030.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,485.76 : 145,557.54 = 84,030.15 : x
2. Step 2: Convert to fraction form
   105,485.76/145,557.54 = 84,030.15/x
3. Step 3: Cross multiply
   105,485.76x = 145,557.54 × 84,030.15
4. Step 4: Simplify right side
   105,485.76x = 12,231,221,919.83
5. Step 5: Solve for x
   x = 12,231,221,919.83/105,485.76
6. Step 6: Final answer
   x = 115,951.40