Finding the Fourth Proportional to 139,587.32, 209,474.78 and 139,073.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,587.32 : 209,474.78 = 139,073.72 : x
2. Step 2: Convert to fraction form
   139,587.32/209,474.78 = 139,073.72/x
3. Step 3: Cross multiply
   139,587.32x = 209,474.78 × 139,073.72
4. Step 4: Simplify right side
   139,587.32x = 29,132,435,158.04
5. Step 5: Solve for x
   x = 29,132,435,158.04/139,587.32
6. Step 6: Final answer
   x = 208,704.03