Finding the Fourth Proportional to 1,687.12, 2,328.72 and 1,066.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.12 : 2,328.72 = 1,066.48 : x
2. Step 2: Convert to fraction form
   1,687.12/2,328.72 = 1,066.48/x
3. Step 3: Cross multiply
   1,687.12x = 2,328.72 × 1,066.48
4. Step 4: Simplify right side
   1,687.12x = 2,483,533.31
5. Step 5: Solve for x
   x = 2,483,533.31/1,687.12
6. Step 6: Final answer
   x = 1,472.05