Finding the Fourth Proportional to 1,078.34, 1,487.86 and 630.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.34 : 1,487.86 = 630.14 : x
2. Step 2: Convert to fraction form
   1,078.34/1,487.86 = 630.14/x
3. Step 3: Cross multiply
   1,078.34x = 1,487.86 × 630.14
4. Step 4: Simplify right side
   1,078.34x = 937,560.10
5. Step 5: Solve for x
   x = 937,560.10/1,078.34
6. Step 6: Final answer
   x = 869.45