Finding the Fourth Proportional to 372,481.31, 514,078.38 and 209,156.15

Step by Step Solution

1. Step 1: Write the proportion equation
   372,481.31 : 514,078.38 = 209,156.15 : x
2. Step 2: Convert to fraction form
   372,481.31/514,078.38 = 209,156.15/x
3. Step 3: Cross multiply
   372,481.31x = 514,078.38 × 209,156.15
4. Step 4: Simplify right side
   372,481.31x = 107,522,654,759.04
5. Step 5: Solve for x
   x = 107,522,654,759.04/372,481.31
6. Step 6: Final answer
   x = 288,665.91