Finding the Fourth Proportional to 2,660.50, 3,669.78 and 2,137.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.50 : 3,669.78 = 2,137.78 : x
2. Step 2: Convert to fraction form
   2,660.50/3,669.78 = 2,137.78/x
3. Step 3: Cross multiply
   2,660.50x = 3,669.78 × 2,137.78
4. Step 4: Simplify right side
   2,660.50x = 7,845,182.29
5. Step 5: Solve for x
   x = 7,845,182.29/2,660.50
6. Step 6: Final answer
   x = 2,948.76