Finding the Fourth Proportional to 1,340.47, 2,012.06 and 928.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.47 : 2,012.06 = 928.18 : x
2. Step 2: Convert to fraction form
   1,340.47/2,012.06 = 928.18/x
3. Step 3: Cross multiply
   1,340.47x = 2,012.06 × 928.18
4. Step 4: Simplify right side
   1,340.47x = 1,867,553.85
5. Step 5: Solve for x
   x = 1,867,553.85/1,340.47
6. Step 6: Final answer
   x = 1,393.21