Finding the Fourth Proportional to 139,872.72, 209,991.96 and 83,050.32

Step by Step Solution

1. Step 1: Write the proportion equation
   139,872.72 : 209,991.96 = 83,050.32 : x
2. Step 2: Convert to fraction form
   139,872.72/209,991.96 = 83,050.32/x
3. Step 3: Cross multiply
   139,872.72x = 209,991.96 × 83,050.32
4. Step 4: Simplify right side
   139,872.72x = 17,439,899,475.43
5. Step 5: Solve for x
   x = 17,439,899,475.43/139,872.72
6. Step 6: Final answer
   x = 124,684.07