Finding the Fourth Proportional to 1,550.41, 2,139.01 and 920.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.41 : 2,139.01 = 920.45 : x
2. Step 2: Convert to fraction form
   1,550.41/2,139.01 = 920.45/x
3. Step 3: Cross multiply
   1,550.41x = 2,139.01 × 920.45
4. Step 4: Simplify right side
   1,550.41x = 1,968,851.75
5. Step 5: Solve for x
   x = 1,968,851.75/1,550.41
6. Step 6: Final answer
   x = 1,269.89