Finding the Fourth Proportional to 3,990.84, 5,507.32 and 2,222.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.84 : 5,507.32 = 2,222.60 : x
2. Step 2: Convert to fraction form
   3,990.84/5,507.32 = 2,222.60/x
3. Step 3: Cross multiply
   3,990.84x = 5,507.32 × 2,222.60
4. Step 4: Simplify right side
   3,990.84x = 12,240,569.43
5. Step 5: Solve for x
   x = 12,240,569.43/3,990.84
6. Step 6: Final answer
   x = 3,067.17