Finding the Fourth Proportional to 105,582.28, 158,005.25 and 86,385.05

Step by Step Solution

1. Step 1: Write the proportion equation
   105,582.28 : 158,005.25 = 86,385.05 : x
2. Step 2: Convert to fraction form
   105,582.28/158,005.25 = 86,385.05/x
3. Step 3: Cross multiply
   105,582.28x = 158,005.25 × 86,385.05
4. Step 4: Simplify right side
   105,582.28x = 13,649,291,242.46
5. Step 5: Solve for x
   x = 13,649,291,242.46/105,582.28
6. Step 6: Final answer
   x = 129,276.35