Finding the Fourth Proportional to 2,149.18, 3,221.31 and 992.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,149.18 : 3,221.31 = 992.50 : x
2. Step 2: Convert to fraction form
   2,149.18/3,221.31 = 992.50/x
3. Step 3: Cross multiply
   2,149.18x = 3,221.31 × 992.50
4. Step 4: Simplify right side
   2,149.18x = 3,197,150.18
5. Step 5: Solve for x
   x = 3,197,150.18/2,149.18
6. Step 6: Final answer
   x = 1,487.61