Finding the Fourth Proportional to 1,490.15, 2,055.89 and 869.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.15 : 2,055.89 = 869.15 : x
2. Step 2: Convert to fraction form
   1,490.15/2,055.89 = 869.15/x
3. Step 3: Cross multiply
   1,490.15x = 2,055.89 × 869.15
4. Step 4: Simplify right side
   1,490.15x = 1,786,862.17
5. Step 5: Solve for x
   x = 1,786,862.17/1,490.15
6. Step 6: Final answer
   x = 1,199.12