Finding the Fourth Proportional to 2,620.21, 3,615.69 and 1,572.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.21 : 3,615.69 = 1,572.07 : x
2. Step 2: Convert to fraction form
   2,620.21/3,615.69 = 1,572.07/x
3. Step 3: Cross multiply
   2,620.21x = 3,615.69 × 1,572.07
4. Step 4: Simplify right side
   2,620.21x = 5,684,117.78
5. Step 5: Solve for x
   x = 5,684,117.78/2,620.21
6. Step 6: Final answer
   x = 2,169.34