Finding the Fourth Proportional to 1,689.57, 2,331.63 and 981.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.57 : 2,331.63 = 981.59 : x
2. Step 2: Convert to fraction form
   1,689.57/2,331.63 = 981.59/x
3. Step 3: Cross multiply
   1,689.57x = 2,331.63 × 981.59
4. Step 4: Simplify right side
   1,689.57x = 2,288,693.03
5. Step 5: Solve for x
   x = 2,288,693.03/1,689.57
6. Step 6: Final answer
   x = 1,354.60