Finding the Fourth Proportional to 139,398.57, 209,073.18 and 63,479.70

Step by Step Solution

1. Step 1: Write the proportion equation
   139,398.57 : 209,073.18 = 63,479.70 : x
2. Step 2: Convert to fraction form
   139,398.57/209,073.18 = 63,479.70/x
3. Step 3: Cross multiply
   139,398.57x = 209,073.18 × 63,479.70
4. Step 4: Simplify right side
   139,398.57x = 13,271,902,744.45
5. Step 5: Solve for x
   x = 13,271,902,744.45/139,398.57
6. Step 6: Final answer
   x = 95,208.31