Finding the Fourth Proportional to 360,339.76, 497,274.88 and 209,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   360,339.76 : 497,274.88 = 209,436.72 : x
2. Step 2: Convert to fraction form
   360,339.76/497,274.88 = 209,436.72/x
3. Step 3: Cross multiply
   360,339.76x = 497,274.88 × 209,436.72
4. Step 4: Simplify right side
   360,339.76x = 104,147,619,805.59
5. Step 5: Solve for x
   x = 104,147,619,805.59/360,339.76
6. Step 6: Final answer
   x = 289,026.17