Finding the Fourth Proportional to 139,863.36, 209,793.50 and 83,719.16

Step by Step Solution

1. Step 1: Write the proportion equation
   139,863.36 : 209,793.50 = 83,719.16 : x
2. Step 2: Convert to fraction form
   139,863.36/209,793.50 = 83,719.16/x
3. Step 3: Cross multiply
   139,863.36x = 209,793.50 × 83,719.16
4. Step 4: Simplify right side
   139,863.36x = 17,563,734,125.90
5. Step 5: Solve for x
   x = 17,563,734,125.90/139,863.36
6. Step 6: Final answer
   x = 125,577.81