Finding the Fourth Proportional to 1,687.50, 2,329.12 and 1,066.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,687.50 : 2,329.12 = 1,066.86 : x
2. Step 2: Convert to fraction form
   1,687.50/2,329.12 = 1,066.86/x
3. Step 3: Cross multiply
   1,687.50x = 2,329.12 × 1,066.86
4. Step 4: Simplify right side
   1,687.50x = 2,484,844.96
5. Step 5: Solve for x
   x = 2,484,844.96/1,687.50
6. Step 6: Final answer
   x = 1,472.50