Finding the Fourth Proportional to 2,688.32, 3,710.04 and 1,640.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.32 : 3,710.04 = 1,640.72 : x
2. Step 2: Convert to fraction form
   2,688.32/3,710.04 = 1,640.72/x
3. Step 3: Cross multiply
   2,688.32x = 3,710.04 × 1,640.72
4. Step 4: Simplify right side
   2,688.32x = 6,087,136.83
5. Step 5: Solve for x
   x = 6,087,136.83/2,688.32
6. Step 6: Final answer
   x = 2,264.29