Finding the Fourth Proportional to 2,970.72, 4,457.60 and 1,217

Step by Step Solution

1. Step 1: Write the proportion equation
   2,970.72 : 4,457.60 = 1,217 : x
2. Step 2: Convert to fraction form
   2,970.72/4,457.60 = 1,217/x
3. Step 3: Cross multiply
   2,970.72x = 4,457.60 × 1,217
4. Step 4: Simplify right side
   2,970.72x = 5,424,899.20
5. Step 5: Solve for x
   x = 5,424,899.20/2,970.72
6. Step 6: Final answer
   x = 1,826.12