Finding the Fourth Proportional to 139,401.78, 209,103.75 and 34,221.66

Step by Step Solution

1. Step 1: Write the proportion equation
   139,401.78 : 209,103.75 = 34,221.66 : x
2. Step 2: Convert to fraction form
   139,401.78/209,103.75 = 34,221.66/x
3. Step 3: Cross multiply
   139,401.78x = 209,103.75 × 34,221.66
4. Step 4: Simplify right side
   139,401.78x = 7,155,877,437.23
5. Step 5: Solve for x
   x = 7,155,877,437.23/139,401.78
6. Step 6: Final answer
   x = 51,332.76