Finding the Fourth Proportional to 1,661.64, 2,290.62 and 1,162.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.64 : 2,290.62 = 1,162.72 : x
2. Step 2: Convert to fraction form
   1,661.64/2,290.62 = 1,162.72/x
3. Step 3: Cross multiply
   1,661.64x = 2,290.62 × 1,162.72
4. Step 4: Simplify right side
   1,661.64x = 2,663,349.69
5. Step 5: Solve for x
   x = 2,663,349.69/1,661.64
6. Step 6: Final answer
   x = 1,602.84