Finding the Fourth Proportional to 1,247.31, 1,871.06 and 630.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.31 : 1,871.06 = 630.59 : x
2. Step 2: Convert to fraction form
   1,247.31/1,871.06 = 630.59/x
3. Step 3: Cross multiply
   1,247.31x = 1,871.06 × 630.59
4. Step 4: Simplify right side
   1,247.31x = 1,179,859.22
5. Step 5: Solve for x
   x = 1,179,859.22/1,247.31
6. Step 6: Final answer
   x = 945.92