Finding the Fourth Proportional to 1,550.25, 2,139.01 and 920.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.25 : 2,139.01 = 920.99 : x
2. Step 2: Convert to fraction form
   1,550.25/2,139.01 = 920.99/x
3. Step 3: Cross multiply
   1,550.25x = 2,139.01 × 920.99
4. Step 4: Simplify right side
   1,550.25x = 1,970,003.57
5. Step 5: Solve for x
   x = 1,970,003.57/1,550.25
6. Step 6: Final answer
   x = 1,270.77