Finding the Fourth Proportional to 2,607.78, 3,906.80 and 1,310.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,607.78 : 3,906.80 = 1,310.16 : x
2. Step 2: Convert to fraction form
   2,607.78/3,906.80 = 1,310.16/x
3. Step 3: Cross multiply
   2,607.78x = 3,906.80 × 1,310.16
4. Step 4: Simplify right side
   2,607.78x = 5,118,533.09
5. Step 5: Solve for x
   x = 5,118,533.09/2,607.78
6. Step 6: Final answer
   x = 1,962.79