Finding the Fourth Proportional to 2,615.36, 3,922.40 and 1,316.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.36 : 3,922.40 = 1,316.16 : x
2. Step 2: Convert to fraction form
   2,615.36/3,922.40 = 1,316.16/x
3. Step 3: Cross multiply
   2,615.36x = 3,922.40 × 1,316.16
4. Step 4: Simplify right side
   2,615.36x = 5,162,505.98
5. Step 5: Solve for x
   x = 5,162,505.98/2,615.36
6. Step 6: Final answer
   x = 1,973.92