Finding the Fourth Proportional to 2,145.68, 3,216.72 and 992.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.68 : 3,216.72 = 992.24 : x
2. Step 2: Convert to fraction form
   2,145.68/3,216.72 = 992.24/x
3. Step 3: Cross multiply
   2,145.68x = 3,216.72 × 992.24
4. Step 4: Simplify right side
   2,145.68x = 3,191,758.25
5. Step 5: Solve for x
   x = 3,191,758.25/2,145.68
6. Step 6: Final answer
   x = 1,487.53