Finding the Fourth Proportional to 1,490.48, 2,056.82 and 861.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.48 : 2,056.82 = 861.02 : x
2. Step 2: Convert to fraction form
   1,490.48/2,056.82 = 861.02/x
3. Step 3: Cross multiply
   1,490.48x = 2,056.82 × 861.02
4. Step 4: Simplify right side
   1,490.48x = 1,770,963.16
5. Step 5: Solve for x
   x = 1,770,963.16/1,490.48
6. Step 6: Final answer
   x = 1,188.18