Finding the Fourth Proportional to 1,490.84, 2,057.31 and 861.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.84 : 2,057.31 = 861.34 : x
2. Step 2: Convert to fraction form
   1,490.84/2,057.31 = 861.34/x
3. Step 3: Cross multiply
   1,490.84x = 2,057.31 × 861.34
4. Step 4: Simplify right side
   1,490.84x = 1,772,043.40
5. Step 5: Solve for x
   x = 1,772,043.40/1,490.84
6. Step 6: Final answer
   x = 1,188.62