Finding the Fourth Proportional to 1,550.66, 2,139.60 and 887.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.66 : 2,139.60 = 887.72 : x
2. Step 2: Convert to fraction form
   1,550.66/2,139.60 = 887.72/x
3. Step 3: Cross multiply
   1,550.66x = 2,139.60 × 887.72
4. Step 4: Simplify right side
   1,550.66x = 1,899,365.71
5. Step 5: Solve for x
   x = 1,899,365.71/1,550.66
6. Step 6: Final answer
   x = 1,224.88