Finding the Fourth Proportional to 1,107.89, 1,527.89 and 921.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,107.89 : 1,527.89 = 921.99 : x
2. Step 2: Convert to fraction form
   1,107.89/1,527.89 = 921.99/x
3. Step 3: Cross multiply
   1,107.89x = 1,527.89 × 921.99
4. Step 4: Simplify right side
   1,107.89x = 1,408,694.69
5. Step 5: Solve for x
   x = 1,408,694.69/1,107.89
6. Step 6: Final answer
   x = 1,271.52