Finding the Fourth Proportional to 1,550.74, 2,139.98 and 887.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.74 : 2,139.98 = 887.55 : x
2. Step 2: Convert to fraction form
   1,550.74/2,139.98 = 887.55/x
3. Step 3: Cross multiply
   1,550.74x = 2,139.98 × 887.55
4. Step 4: Simplify right side
   1,550.74x = 1,899,333.90
5. Step 5: Solve for x
   x = 1,899,333.90/1,550.74
6. Step 6: Final answer
   x = 1,224.79