Finding the Fourth Proportional to 2,211.72, 3,317.94 and 913.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.72 : 3,317.94 = 913.32 : x
2. Step 2: Convert to fraction form
   2,211.72/3,317.94 = 913.32/x
3. Step 3: Cross multiply
   2,211.72x = 3,317.94 × 913.32
4. Step 4: Simplify right side
   2,211.72x = 3,030,340.96
5. Step 5: Solve for x
   x = 3,030,340.96/2,211.72
6. Step 6: Final answer
   x = 1,370.13