Finding the Fourth Proportional to 1,061.39, 1,464.21 and 921.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.39 : 1,464.21 = 921.33 : x
2. Step 2: Convert to fraction form
   1,061.39/1,464.21 = 921.33/x
3. Step 3: Cross multiply
   1,061.39x = 1,464.21 × 921.33
4. Step 4: Simplify right side
   1,061.39x = 1,349,020.60
5. Step 5: Solve for x
   x = 1,349,020.60/1,061.39
6. Step 6: Final answer
   x = 1,270.99