Finding the Fourth Proportional to 1,689.30, 2,331.36 and 981.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.30 : 2,331.36 = 981.34 : x
2. Step 2: Convert to fraction form
   1,689.30/2,331.36 = 981.34/x
3. Step 3: Cross multiply
   1,689.30x = 2,331.36 × 981.34
4. Step 4: Simplify right side
   1,689.30x = 2,287,856.82
5. Step 5: Solve for x
   x = 2,287,856.82/1,689.30
6. Step 6: Final answer
   x = 1,354.32