Finding the Fourth Proportional to 1,110.42, 1,532.23 and 638.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,110.42 : 1,532.23 = 638.34 : x
2. Step 2: Convert to fraction form
   1,110.42/1,532.23 = 638.34/x
3. Step 3: Cross multiply
   1,110.42x = 1,532.23 × 638.34
4. Step 4: Simplify right side
   1,110.42x = 978,082.10
5. Step 5: Solve for x
   x = 978,082.10/1,110.42
6. Step 6: Final answer
   x = 880.82