Finding the Fourth Proportional to 2,385.20, 3,290.60 and 1,720.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.20 : 3,290.60 = 1,720.59 : x
2. Step 2: Convert to fraction form
   2,385.20/3,290.60 = 1,720.59/x
3. Step 3: Cross multiply
   2,385.20x = 3,290.60 × 1,720.59
4. Step 4: Simplify right side
   2,385.20x = 5,661,779.09
5. Step 5: Solve for x
   x = 5,661,779.09/2,385.20
6. Step 6: Final answer
   x = 2,373.72