Finding the Fourth Proportional to 1,665.31, 2,498.29 and 1,393.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.31 : 2,498.29 = 1,393.30 : x
2. Step 2: Convert to fraction form
   1,665.31/2,498.29 = 1,393.30/x
3. Step 3: Cross multiply
   1,665.31x = 2,498.29 × 1,393.30
4. Step 4: Simplify right side
   1,665.31x = 3,480,874.93
5. Step 5: Solve for x
   x = 3,480,874.93/1,665.31
6. Step 6: Final answer
   x = 2,090.23