Finding the Fourth Proportional to 2,215.02, 3,056.69 and 1,220.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.02 : 3,056.69 = 1,220.30 : x
2. Step 2: Convert to fraction form
   2,215.02/3,056.69 = 1,220.30/x
3. Step 3: Cross multiply
   2,215.02x = 3,056.69 × 1,220.30
4. Step 4: Simplify right side
   2,215.02x = 3,730,063.52
5. Step 5: Solve for x
   x = 3,730,063.52/2,215.02
6. Step 6: Final answer
   x = 1,683.99