Finding the Fourth Proportional to 131,009.55, 196,662.15 and 86,722.80

Step by Step Solution

1. Step 1: Write the proportion equation
   131,009.55 : 196,662.15 = 86,722.80 : x
2. Step 2: Convert to fraction form
   131,009.55/196,662.15 = 86,722.80/x
3. Step 3: Cross multiply
   131,009.55x = 196,662.15 × 86,722.80
4. Step 4: Simplify right side
   131,009.55x = 17,055,092,302.02
5. Step 5: Solve for x
   x = 17,055,092,302.02/131,009.55
6. Step 6: Final answer
   x = 130,182.05