Finding the Fourth Proportional to 1,589.32, 2,188.72 and 1,555.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,589.32 : 2,188.72 = 1,555.40 : x
2. Step 2: Convert to fraction form
   1,589.32/2,188.72 = 1,555.40/x
3. Step 3: Cross multiply
   1,589.32x = 2,188.72 × 1,555.40
4. Step 4: Simplify right side
   1,589.32x = 3,404,335.09
5. Step 5: Solve for x
   x = 3,404,335.09/1,589.32
6. Step 6: Final answer
   x = 2,142.01