Finding the Fourth Proportional to 1,177.61, 1,625.27 and 680.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,177.61 : 1,625.27 = 680.15 : x
2. Step 2: Convert to fraction form
   1,177.61/1,625.27 = 680.15/x
3. Step 3: Cross multiply
   1,177.61x = 1,625.27 × 680.15
4. Step 4: Simplify right side
   1,177.61x = 1,105,427.39
5. Step 5: Solve for x
   x = 1,105,427.39/1,177.61
6. Step 6: Final answer
   x = 938.70