Finding the Fourth Proportional to 1,662.64, 2,293.20 and 1,072.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.64 : 2,293.20 = 1,072.72 : x
2. Step 2: Convert to fraction form
   1,662.64/2,293.20 = 1,072.72/x
3. Step 3: Cross multiply
   1,662.64x = 2,293.20 × 1,072.72
4. Step 4: Simplify right side
   1,662.64x = 2,459,961.50
5. Step 5: Solve for x
   x = 2,459,961.50/1,662.64
6. Step 6: Final answer
   x = 1,479.55