Finding the Fourth Proportional to 1,550.88, 2,140.52 and 921.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,550.88 : 2,140.52 = 921.76 : x
2. Step 2: Convert to fraction form
   1,550.88/2,140.52 = 921.76/x
3. Step 3: Cross multiply
   1,550.88x = 2,140.52 × 921.76
4. Step 4: Simplify right side
   1,550.88x = 1,973,045.72
5. Step 5: Solve for x
   x = 1,973,045.72/1,550.88
6. Step 6: Final answer
   x = 1,272.21