Finding the Fourth Proportional to 2,800.30, 3,859.86 and 2,238.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,800.30 : 3,859.86 = 2,238.98 : x
2. Step 2: Convert to fraction form
   2,800.30/3,859.86 = 2,238.98/x
3. Step 3: Cross multiply
   2,800.30x = 3,859.86 × 2,238.98
4. Step 4: Simplify right side
   2,800.30x = 8,642,149.34
5. Step 5: Solve for x
   x = 8,642,149.34/2,800.30
6. Step 6: Final answer
   x = 3,086.15