Finding the Fourth Proportional to 2,146.96, 3,221.61 and 992.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.96 : 3,221.61 = 992.71 : x
2. Step 2: Convert to fraction form
   2,146.96/3,221.61 = 992.71/x
3. Step 3: Cross multiply
   2,146.96x = 3,221.61 × 992.71
4. Step 4: Simplify right side
   2,146.96x = 3,198,124.46
5. Step 5: Solve for x
   x = 3,198,124.46/2,146.96
6. Step 6: Final answer
   x = 1,489.61