Finding the Fourth Proportional to 2,213.16, 3,319.72 and 981.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.16 : 3,319.72 = 981.12 : x
2. Step 2: Convert to fraction form
   2,213.16/3,319.72 = 981.12/x
3. Step 3: Cross multiply
   2,213.16x = 3,319.72 × 981.12
4. Step 4: Simplify right side
   2,213.16x = 3,257,043.69
5. Step 5: Solve for x
   x = 3,257,043.69/2,213.16
6. Step 6: Final answer
   x = 1,471.67