Finding the Fourth Proportional to 2,217.90, 3,321.81 and 1,777.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,217.90 : 3,321.81 = 1,777.62 : x
2. Step 2: Convert to fraction form
   2,217.90/3,321.81 = 1,777.62/x
3. Step 3: Cross multiply
   2,217.90x = 3,321.81 × 1,777.62
4. Step 4: Simplify right side
   2,217.90x = 5,904,915.89
5. Step 5: Solve for x
   x = 5,904,915.89/2,217.90
6. Step 6: Final answer
   x = 2,662.39