Finding the Fourth Proportional to 209,085.30, 288,536.18 and 113,592.78

Step by Step Solution

1. Step 1: Write the proportion equation
   209,085.30 : 288,536.18 = 113,592.78 : x
2. Step 2: Convert to fraction form
   209,085.30/288,536.18 = 113,592.78/x
3. Step 3: Cross multiply
   209,085.30x = 288,536.18 × 113,592.78
4. Step 4: Simplify right side
   209,085.30x = 32,775,626,248.82
5. Step 5: Solve for x
   x = 32,775,626,248.82/209,085.30
6. Step 6: Final answer
   x = 156,757.20