Finding the Fourth Proportional to 1,123.10, 1,549.50 and 697.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.10 : 1,549.50 = 697.40 : x
2. Step 2: Convert to fraction form
   1,123.10/1,549.50 = 697.40/x
3. Step 3: Cross multiply
   1,123.10x = 1,549.50 × 697.40
4. Step 4: Simplify right side
   1,123.10x = 1,080,621.30
5. Step 5: Solve for x
   x = 1,080,621.30/1,123.10
6. Step 6: Final answer
   x = 962.18