Finding the Fourth Proportional to 1,550.15, 2,138.59 and 886.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.15 : 2,138.59 = 886.87 : x
2. Step 2: Convert to fraction form
   1,550.15/2,138.59 = 886.87/x
3. Step 3: Cross multiply
   1,550.15x = 2,138.59 × 886.87
4. Step 4: Simplify right side
   1,550.15x = 1,896,659.86
5. Step 5: Solve for x
   x = 1,896,659.86/1,550.15
6. Step 6: Final answer
   x = 1,223.53