Finding the Fourth Proportional to 2,212.32, 3,053.12 and 1,217.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,212.32 : 3,053.12 = 1,217.72 : x
2. Step 2: Convert to fraction form
   2,212.32/3,053.12 = 1,217.72/x
3. Step 3: Cross multiply
   2,212.32x = 3,053.12 × 1,217.72
4. Step 4: Simplify right side
   2,212.32x = 3,717,845.29
5. Step 5: Solve for x
   x = 3,717,845.29/2,212.32
6. Step 6: Final answer
   x = 1,680.52