Finding the Fourth Proportional to 1,550.72, 2,139.85 and 1,256.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.72 : 2,139.85 = 1,256.69 : x
2. Step 2: Convert to fraction form
   1,550.72/2,139.85 = 1,256.69/x
3. Step 3: Cross multiply
   1,550.72x = 2,139.85 × 1,256.69
4. Step 4: Simplify right side
   1,550.72x = 2,689,135.02
5. Step 5: Solve for x
   x = 2,689,135.02/1,550.72
6. Step 6: Final answer
   x = 1,734.12