Finding the Fourth Proportional to 1,178.08, 1,625.89 and 680.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178.08 : 1,625.89 = 680.86 : x
2. Step 2: Convert to fraction form
   1,178.08/1,625.89 = 680.86/x
3. Step 3: Cross multiply
   1,178.08x = 1,625.89 × 680.86
4. Step 4: Simplify right side
   1,178.08x = 1,107,003.47
5. Step 5: Solve for x
   x = 1,107,003.47/1,178.08
6. Step 6: Final answer
   x = 939.67