Finding the Fourth Proportional to 1,490.66, 2,057.18 and 861.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.66 : 2,057.18 = 861.27 : x
2. Step 2: Convert to fraction form
   1,490.66/2,057.18 = 861.27/x
3. Step 3: Cross multiply
   1,490.66x = 2,057.18 × 861.27
4. Step 4: Simplify right side
   1,490.66x = 1,771,783.61
5. Step 5: Solve for x
   x = 1,771,783.61/1,490.66
6. Step 6: Final answer
   x = 1,188.59