Finding the Fourth Proportional to 2,620.72, 3,616.60 and 1,572.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.72 : 3,616.60 = 1,572.78 : x
2. Step 2: Convert to fraction form
   2,620.72/3,616.60 = 1,572.78/x
3. Step 3: Cross multiply
   2,620.72x = 3,616.60 × 1,572.78
4. Step 4: Simplify right side
   2,620.72x = 5,688,108.28
5. Step 5: Solve for x
   x = 5,688,108.28/2,620.72
6. Step 6: Final answer
   x = 2,170.44