Finding the Fourth Proportional to 1,362.91, 1,881.42 and 921.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,362.91 : 1,881.42 = 921.07 : x
2. Step 2: Convert to fraction form
   1,362.91/1,881.42 = 921.07/x
3. Step 3: Cross multiply
   1,362.91x = 1,881.42 × 921.07
4. Step 4: Simplify right side
   1,362.91x = 1,732,919.52
5. Step 5: Solve for x
   x = 1,732,919.52/1,362.91
6. Step 6: Final answer
   x = 1,271.48