Finding the Fourth Proportional to 2,210.39, 3,315.98 and 911.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,210.39 : 3,315.98 = 911.96 : x
2. Step 2: Convert to fraction form
   2,210.39/3,315.98 = 911.96/x
3. Step 3: Cross multiply
   2,210.39x = 3,315.98 × 911.96
4. Step 4: Simplify right side
   2,210.39x = 3,024,024.54
5. Step 5: Solve for x
   x = 3,024,024.54/2,210.39
6. Step 6: Final answer
   x = 1,368.10