Finding the Fourth Proportional to 2,822.31, 4,231.98 and 972.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,822.31 : 4,231.98 = 972.81 : x
2. Step 2: Convert to fraction form
   2,822.31/4,231.98 = 972.81/x
3. Step 3: Cross multiply
   2,822.31x = 4,231.98 × 972.81
4. Step 4: Simplify right side
   2,822.31x = 4,116,912.46
5. Step 5: Solve for x
   x = 4,116,912.46/2,822.31
6. Step 6: Final answer
   x = 1,458.70