Finding the Fourth Proportional to 1,609.32, 2,219.16 and 1,215.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.32 : 2,219.16 = 1,215.72 : x
2. Step 2: Convert to fraction form
   1,609.32/2,219.16 = 1,215.72/x
3. Step 3: Cross multiply
   1,609.32x = 2,219.16 × 1,215.72
4. Step 4: Simplify right side
   1,609.32x = 2,697,877.20
5. Step 5: Solve for x
   x = 2,697,877.20/1,609.32
6. Step 6: Final answer
   x = 1,676.41