Finding the Fourth Proportional to 1,238.55, 1,709.15 and 679.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.55 : 1,709.15 = 679.02 : x
2. Step 2: Convert to fraction form
   1,238.55/1,709.15 = 679.02/x
3. Step 3: Cross multiply
   1,238.55x = 1,709.15 × 679.02
4. Step 4: Simplify right side
   1,238.55x = 1,160,543.64
5. Step 5: Solve for x
   x = 1,160,543.64/1,238.55
6. Step 6: Final answer
   x = 937.02