Finding the Fourth Proportional to 1,247.67, 1,870.56 and 630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.67 : 1,870.56 = 630.72 : x
2. Step 2: Convert to fraction form
   1,247.67/1,870.56 = 630.72/x
3. Step 3: Cross multiply
   1,247.67x = 1,870.56 × 630.72
4. Step 4: Simplify right side
   1,247.67x = 1,179,799.60
5. Step 5: Solve for x
   x = 1,179,799.60/1,247.67
6. Step 6: Final answer
   x = 945.60