Finding the Fourth Proportional to 139,790.13, 209,680.74 and 83,251.86

Step by Step Solution

1. Step 1: Write the proportion equation
   139,790.13 : 209,680.74 = 83,251.86 : x
2. Step 2: Convert to fraction form
   139,790.13/209,680.74 = 83,251.86/x
3. Step 3: Cross multiply
   139,790.13x = 209,680.74 × 83,251.86
4. Step 4: Simplify right side
   139,790.13x = 17,456,311,611.18
5. Step 5: Solve for x
   x = 17,456,311,611.18/139,790.13
6. Step 6: Final answer
   x = 124,875.14