Finding the Fourth Proportional to 1,356.12, 1,874.88 and 1,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,356.12 : 1,874.88 = 1,061.28 : x
2. Step 2: Convert to fraction form
   1,356.12/1,874.88 = 1,061.28/x
3. Step 3: Cross multiply
   1,356.12x = 1,874.88 × 1,061.28
4. Step 4: Simplify right side
   1,356.12x = 1,989,772.65
5. Step 5: Solve for x
   x = 1,989,772.65/1,356.12
6. Step 6: Final answer
   x = 1,467.25