Finding the Fourth Proportional to 1,440.80, 2,158.32 and 926.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.80 : 2,158.32 = 926.72 : x
2. Step 2: Convert to fraction form
   1,440.80/2,158.32 = 926.72/x
3. Step 3: Cross multiply
   1,440.80x = 2,158.32 × 926.72
4. Step 4: Simplify right side
   1,440.80x = 2,000,158.31
5. Step 5: Solve for x
   x = 2,000,158.31/1,440.80
6. Step 6: Final answer
   x = 1,388.23