Finding the Fourth Proportional to 2,215.16, 3,320.06 and 981.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.16 : 3,320.06 = 981.18 : x
2. Step 2: Convert to fraction form
   2,215.16/3,320.06 = 981.18/x
3. Step 3: Cross multiply
   2,215.16x = 3,320.06 × 981.18
4. Step 4: Simplify right side
   2,215.16x = 3,257,576.47
5. Step 5: Solve for x
   x = 3,257,576.47/2,215.16
6. Step 6: Final answer
   x = 1,470.58