Finding the Fourth Proportional to 1,550.68, 2,139.72 and 887.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.68 : 2,139.72 = 887.39 : x
2. Step 2: Convert to fraction form
   1,550.68/2,139.72 = 887.39/x
3. Step 3: Cross multiply
   1,550.68x = 2,139.72 × 887.39
4. Step 4: Simplify right side
   1,550.68x = 1,898,760.13
5. Step 5: Solve for x
   x = 1,898,760.13/1,550.68
6. Step 6: Final answer
   x = 1,224.47