Finding the Fourth Proportional to 2,156.97, 2,976.60 and 1,225.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,156.97 : 2,976.60 = 1,225.47 : x
2. Step 2: Convert to fraction form
   2,156.97/2,976.60 = 1,225.47/x
3. Step 3: Cross multiply
   2,156.97x = 2,976.60 × 1,225.47
4. Step 4: Simplify right side
   2,156.97x = 3,647,738.60
5. Step 5: Solve for x
   x = 3,647,738.60/2,156.97
6. Step 6: Final answer
   x = 1,691.14