Finding the Fourth Proportional to 1,556.49, 2,147.57 and 926.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.49 : 2,147.57 = 926.61 : x
2. Step 2: Convert to fraction form
   1,556.49/2,147.57 = 926.61/x
3. Step 3: Cross multiply
   1,556.49x = 2,147.57 × 926.61
4. Step 4: Simplify right side
   1,556.49x = 1,989,962.15
5. Step 5: Solve for x
   x = 1,989,962.15/1,556.49
6. Step 6: Final answer
   x = 1,278.50