Finding the Fourth Proportional to 1,102.30, 1,521.33 and 630.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,102.30 : 1,521.33 = 630.38 : x
2. Step 2: Convert to fraction form
   1,102.30/1,521.33 = 630.38/x
3. Step 3: Cross multiply
   1,102.30x = 1,521.33 × 630.38
4. Step 4: Simplify right side
   1,102.30x = 959,016.01
5. Step 5: Solve for x
   x = 959,016.01/1,102.30
6. Step 6: Final answer
   x = 870.01