Finding the Fourth Proportional to 139,565.42, 209,253.37 and 71,008.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,565.42 : 209,253.37 = 71,008.48 : x
2. Step 2: Convert to fraction form
   139,565.42/209,253.37 = 71,008.48/x
3. Step 3: Cross multiply
   139,565.42x = 209,253.37 × 71,008.48
4. Step 4: Simplify right side
   139,565.42x = 14,858,763,738.58
5. Step 5: Solve for x
   x = 14,858,763,738.58/139,565.42
6. Step 6: Final answer
   x = 106,464.51