Finding the Fourth Proportional to 165,488.55, 248,335.43 and 86,659.35

Step by Step Solution

1. Step 1: Write the proportion equation
   165,488.55 : 248,335.43 = 86,659.35 : x
2. Step 2: Convert to fraction form
   165,488.55/248,335.43 = 86,659.35/x
3. Step 3: Cross multiply
   165,488.55x = 248,335.43 × 86,659.35
4. Step 4: Simplify right side
   165,488.55x = 21,520,586,512.47
5. Step 5: Solve for x
   x = 21,520,586,512.47/165,488.55
6. Step 6: Final answer
   x = 130,042.75