Finding the Fourth Proportional to 144,003.30, 216,264.15 and 139,337.70

Step by Step Solution

1. Step 1: Write the proportion equation
   144,003.30 : 216,264.15 = 139,337.70 : x
2. Step 2: Convert to fraction form
   144,003.30/216,264.15 = 139,337.70/x
3. Step 3: Cross multiply
   144,003.30x = 216,264.15 × 139,337.70
4. Step 4: Simplify right side
   144,003.30x = 30,133,749,253.46
5. Step 5: Solve for x
   x = 30,133,749,253.46/144,003.30
6. Step 6: Final answer
   x = 209,257.35