Finding the Fourth Proportional to 2,615.72, 3,923.56 and 1,642.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.72 : 3,923.56 = 1,642.50 : x
2. Step 2: Convert to fraction form
   2,615.72/3,923.56 = 1,642.50/x
3. Step 3: Cross multiply
   2,615.72x = 3,923.56 × 1,642.50
4. Step 4: Simplify right side
   2,615.72x = 6,444,443.19
5. Step 5: Solve for x
   x = 6,444,443.19/2,615.72
6. Step 6: Final answer
   x = 2,463.74