Finding the Fourth Proportional to 1,023.47, 1,412.91 and 630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,023.47 : 1,412.91 = 630.72 : x
2. Step 2: Convert to fraction form
   1,023.47/1,412.91 = 630.72/x
3. Step 3: Cross multiply
   1,023.47x = 1,412.91 × 630.72
4. Step 4: Simplify right side
   1,023.47x = 891,150.60
5. Step 5: Solve for x
   x = 891,150.60/1,023.47
6. Step 6: Final answer
   x = 870.71