Finding the Fourth Proportional to 1,589.32, 2,192.88 and 1,216.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,589.32 : 2,192.88 = 1,216.72 : x
2. Step 2: Convert to fraction form
   1,589.32/2,192.88 = 1,216.72/x
3. Step 3: Cross multiply
   1,589.32x = 2,192.88 × 1,216.72
4. Step 4: Simplify right side
   1,589.32x = 2,668,120.95
5. Step 5: Solve for x
   x = 2,668,120.95/1,589.32
6. Step 6: Final answer
   x = 1,678.78