Finding the Fourth Proportional to 139,598.76, 209,194.02 and 86,847.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,598.76 : 209,194.02 = 86,847.96 : x
2. Step 2: Convert to fraction form
   139,598.76/209,194.02 = 86,847.96/x
3. Step 3: Cross multiply
   139,598.76x = 209,194.02 × 86,847.96
4. Step 4: Simplify right side
   139,598.76x = 18,168,073,881.20
5. Step 5: Solve for x
   x = 18,168,073,881.20/139,598.76
6. Step 6: Final answer
   x = 130,144.95