Finding the Fourth Proportional to 2,212.21, 3,317.86 and 824.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.21 : 3,317.86 = 824.78 : x
2. Step 2: Convert to fraction form
   2,212.21/3,317.86 = 824.78/x
3. Step 3: Cross multiply
   2,212.21x = 3,317.86 × 824.78
4. Step 4: Simplify right side
   2,212.21x = 2,736,513.90
5. Step 5: Solve for x
   x = 2,736,513.90/2,212.21
6. Step 6: Final answer
   x = 1,237.00