Finding the Fourth Proportional to 2,139.02, 3,207.38 and 1,098.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.02 : 3,207.38 = 1,098.60 : x
2. Step 2: Convert to fraction form
   2,139.02/3,207.38 = 1,098.60/x
3. Step 3: Cross multiply
   2,139.02x = 3,207.38 × 1,098.60
4. Step 4: Simplify right side
   2,139.02x = 3,523,627.67
5. Step 5: Solve for x
   x = 3,523,627.67/2,139.02
6. Step 6: Final answer
   x = 1,647.31