Finding the Fourth Proportional to 3,990.89, 5,507.43 and 2,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,990.89 : 5,507.43 = 2,222.50 : x
2. Step 2: Convert to fraction form
   3,990.89/5,507.43 = 2,222.50/x
3. Step 3: Cross multiply
   3,990.89x = 5,507.43 × 2,222.50
4. Step 4: Simplify right side
   3,990.89x = 12,240,263.18
5. Step 5: Solve for x
   x = 12,240,263.18/3,990.89
6. Step 6: Final answer
   x = 3,067.05