Finding the Fourth Proportional to 2,076.80, 2,866.62 and 1,238.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,076.80 : 2,866.62 = 1,238.12 : x
2. Step 2: Convert to fraction form
   2,076.80/2,866.62 = 1,238.12/x
3. Step 3: Cross multiply
   2,076.80x = 2,866.62 × 1,238.12
4. Step 4: Simplify right side
   2,076.80x = 3,549,219.55
5. Step 5: Solve for x
   x = 3,549,219.55/2,076.80
6. Step 6: Final answer
   x = 1,708.98