Finding the Fourth Proportional to 139,401.40, 209,110.12 and 39,553.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,401.40 : 209,110.12 = 39,553.78 : x
2. Step 2: Convert to fraction form
   139,401.40/209,110.12 = 39,553.78/x
3. Step 3: Cross multiply
   139,401.40x = 209,110.12 × 39,553.78
4. Step 4: Simplify right side
   139,401.40x = 8,271,095,682.25
5. Step 5: Solve for x
   x = 8,271,095,682.25/139,401.40
6. Step 6: Final answer
   x = 59,332.95