Finding the Fourth Proportional to 1,127.43, 1,555.77 and 630.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.43 : 1,555.77 = 630.05 : x
2. Step 2: Convert to fraction form
   1,127.43/1,555.77 = 630.05/x
3. Step 3: Cross multiply
   1,127.43x = 1,555.77 × 630.05
4. Step 4: Simplify right side
   1,127.43x = 980,216.78
5. Step 5: Solve for x
   x = 980,216.78/1,127.43
6. Step 6: Final answer
   x = 869.43