Finding the Fourth Proportional to 2,146.31, 3,219.15 and 830.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,146.31 : 3,219.15 = 830.68 : x
2. Step 2: Convert to fraction form
   2,146.31/3,219.15 = 830.68/x
3. Step 3: Cross multiply
   2,146.31x = 3,219.15 × 830.68
4. Step 4: Simplify right side
   2,146.31x = 2,674,083.52
5. Step 5: Solve for x
   x = 2,674,083.52/2,146.31
6. Step 6: Final answer
   x = 1,245.90