Finding the Fourth Proportional to 1,049.76, 1,448.69 and 630.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,049.76 : 1,448.69 = 630.55 : x
2. Step 2: Convert to fraction form
   1,049.76/1,448.69 = 630.55/x
3. Step 3: Cross multiply
   1,049.76x = 1,448.69 × 630.55
4. Step 4: Simplify right side
   1,049.76x = 913,470.14
5. Step 5: Solve for x
   x = 913,470.14/1,049.76
6. Step 6: Final answer
   x = 870.17