Finding the Fourth Proportional to 1,490.59, 2,056.82 and 861.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.59 : 2,056.82 = 861.15 : x
2. Step 2: Convert to fraction form
   1,490.59/2,056.82 = 861.15/x
3. Step 3: Cross multiply
   1,490.59x = 2,056.82 × 861.15
4. Step 4: Simplify right side
   1,490.59x = 1,771,230.54
5. Step 5: Solve for x
   x = 1,771,230.54/1,490.59
6. Step 6: Final answer
   x = 1,188.27