Finding the Fourth Proportional to 2,663.61, 3,990.29 and 1,490.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.61 : 3,990.29 = 1,490.05 : x
2. Step 2: Convert to fraction form
   2,663.61/3,990.29 = 1,490.05/x
3. Step 3: Cross multiply
   2,663.61x = 3,990.29 × 1,490.05
4. Step 4: Simplify right side
   2,663.61x = 5,945,723.90
5. Step 5: Solve for x
   x = 5,945,723.90/2,663.61
6. Step 6: Final answer
   x = 2,232.21