Finding the Fourth Proportional to 2,610.78, 3,607.80 and 1,980.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.78 : 3,607.80 = 1,980.18 : x
2. Step 2: Convert to fraction form
   2,610.78/3,607.80 = 1,980.18/x
3. Step 3: Cross multiply
   2,610.78x = 3,607.80 × 1,980.18
4. Step 4: Simplify right side
   2,610.78x = 7,144,093.40
5. Step 5: Solve for x
   x = 7,144,093.40/2,610.78
6. Step 6: Final answer
   x = 2,736.38