Finding the Fourth Proportional to 139,738.30, 209,588.55 and 55,560.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,738.30 : 209,588.55 = 55,560.40 : x
2. Step 2: Convert to fraction form
   139,738.30/209,588.55 = 55,560.40/x
3. Step 3: Cross multiply
   139,738.30x = 209,588.55 × 55,560.40
4. Step 4: Simplify right side
   139,738.30x = 11,644,823,673.42
5. Step 5: Solve for x
   x = 11,644,823,673.42/139,738.30
6. Step 6: Final answer
   x = 83,333.09