Finding the Fourth Proportional to 139,564.42, 209,251.87 and 71,007.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,564.42 : 209,251.87 = 71,007.48 : x
2. Step 2: Convert to fraction form
   139,564.42/209,251.87 = 71,007.48/x
3. Step 3: Cross multiply
   139,564.42x = 209,251.87 × 71,007.48
4. Step 4: Simplify right side
   139,564.42x = 14,858,447,796.47
5. Step 5: Solve for x
   x = 14,858,447,796.47/139,564.42
6. Step 6: Final answer
   x = 106,463.01