Finding the Fourth Proportional to 1,665.18, 2,499.93 and 1,090.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.18 : 2,499.93 = 1,090.62 : x
2. Step 2: Convert to fraction form
   1,665.18/2,499.93 = 1,090.62/x
3. Step 3: Cross multiply
   1,665.18x = 2,499.93 × 1,090.62
4. Step 4: Simplify right side
   1,665.18x = 2,726,473.66
5. Step 5: Solve for x
   x = 2,726,473.66/1,665.18
6. Step 6: Final answer
   x = 1,637.34