Finding the Fourth Proportional to 139,601.76, 209,198.52 and 86,850.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,601.76 : 209,198.52 = 86,850.96 : x
2. Step 2: Convert to fraction form
   139,601.76/209,198.52 = 86,850.96/x
3. Step 3: Cross multiply
   139,601.76x = 209,198.52 × 86,850.96
4. Step 4: Simplify right side
   139,601.76x = 18,169,092,292.58
5. Step 5: Solve for x
   x = 18,169,092,292.58/139,601.76
6. Step 6: Final answer
   x = 130,149.45