Finding the Fourth Proportional to 2,213.82, 3,320.60 and 915.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.82 : 3,320.60 = 915.26 : x
2. Step 2: Convert to fraction form
   2,213.82/3,320.60 = 915.26/x
3. Step 3: Cross multiply
   2,213.82x = 3,320.60 × 915.26
4. Step 4: Simplify right side
   2,213.82x = 3,039,191.18
5. Step 5: Solve for x
   x = 3,039,191.18/2,213.82
6. Step 6: Final answer
   x = 1,372.83