Finding the Fourth Proportional to 372,485.31, 514,083.90 and 209,160.15

Step by Step Solution

1. Step 1: Write the proportion equation
   372,485.31 : 514,083.90 = 209,160.15 : x
2. Step 2: Convert to fraction form
   372,485.31/514,083.90 = 209,160.15/x
3. Step 3: Cross multiply
   372,485.31x = 514,083.90 × 209,160.15
4. Step 4: Simplify right side
   372,485.31x = 107,525,865,636.59
5. Step 5: Solve for x
   x = 107,525,865,636.59/372,485.31
6. Step 6: Final answer
   x = 288,671.43