Finding the Fourth Proportional to 209,321.18, 288,875.85 and 123,337.49

Step by Step Solution

1. Step 1: Write the proportion equation
   209,321.18 : 288,875.85 = 123,337.49 : x
2. Step 2: Convert to fraction form
   209,321.18/288,875.85 = 123,337.49/x
3. Step 3: Cross multiply
   209,321.18x = 288,875.85 × 123,337.49
4. Step 4: Simplify right side
   209,321.18x = 35,629,221,047.50
5. Step 5: Solve for x
   x = 35,629,221,047.50/209,321.18
6. Step 6: Final answer
   x = 170,213.17