Finding the Fourth Proportional to 2,680.78, 3,699.43 and 1,485.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.78 : 3,699.43 = 1,485.76 : x
2. Step 2: Convert to fraction form
   2,680.78/3,699.43 = 1,485.76/x
3. Step 3: Cross multiply
   2,680.78x = 3,699.43 × 1,485.76
4. Step 4: Simplify right side
   2,680.78x = 5,496,465.12
5. Step 5: Solve for x
   x = 5,496,465.12/2,680.78
6. Step 6: Final answer
   x = 2,050.32