Finding the Fourth Proportional to 2,178.72, 3,262 and 1,664.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,178.72 : 3,262 = 1,664.16 : x
2. Step 2: Convert to fraction form
   2,178.72/3,262 = 1,664.16/x
3. Step 3: Cross multiply
   2,178.72x = 3,262 × 1,664.16
4. Step 4: Simplify right side
   2,178.72x = 5,428,489.92
5. Step 5: Solve for x
   x = 5,428,489.92/2,178.72
6. Step 6: Final answer
   x = 2,491.60