Finding the Fourth Proportional to 2,216.52, 3,322.92 and 918.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.52 : 3,322.92 = 918.90 : x
2. Step 2: Convert to fraction form
   2,216.52/3,322.92 = 918.90/x
3. Step 3: Cross multiply
   2,216.52x = 3,322.92 × 918.90
4. Step 4: Simplify right side
   2,216.52x = 3,053,431.19
5. Step 5: Solve for x
   x = 3,053,431.19/2,216.52
6. Step 6: Final answer
   x = 1,377.58