Finding the Fourth Proportional to 5,006.72, 7,510.05 and 1,720.05

Step by Step Solution

1. Step 1: Write the proportion equation
   5,006.72 : 7,510.05 = 1,720.05 : x
2. Step 2: Convert to fraction form
   5,006.72/7,510.05 = 1,720.05/x
3. Step 3: Cross multiply
   5,006.72x = 7,510.05 × 1,720.05
4. Step 4: Simplify right side
   5,006.72x = 12,917,661.50
5. Step 5: Solve for x
   x = 12,917,661.50/5,006.72
6. Step 6: Final answer
   x = 2,580.07