Finding the Fourth Proportional to 1,550.46, 2,139.50 and 887.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.46 : 2,139.50 = 887.21 : x
2. Step 2: Convert to fraction form
   1,550.46/2,139.50 = 887.21/x
3. Step 3: Cross multiply
   1,550.46x = 2,139.50 × 887.21
4. Step 4: Simplify right side
   1,550.46x = 1,898,185.80
5. Step 5: Solve for x
   x = 1,898,185.80/1,550.46
6. Step 6: Final answer
   x = 1,224.27