Finding the Fourth Proportional to 1,127.51, 1,555.95 and 630.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.51 : 1,555.95 = 630.15 : x
2. Step 2: Convert to fraction form
   1,127.51/1,555.95 = 630.15/x
3. Step 3: Cross multiply
   1,127.51x = 1,555.95 × 630.15
4. Step 4: Simplify right side
   1,127.51x = 980,481.89
5. Step 5: Solve for x
   x = 980,481.89/1,127.51
6. Step 6: Final answer
   x = 869.60