Finding the Fourth Proportional to 2,807, 4,212.78 and 2,398.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,807 : 4,212.78 = 2,398.76 : x
2. Step 2: Convert to fraction form
   2,807/4,212.78 = 2,398.76/x
3. Step 3: Cross multiply
   2,807x = 4,212.78 × 2,398.76
4. Step 4: Simplify right side
   2,807x = 10,105,448.15
5. Step 5: Solve for x
   x = 10,105,448.15/2,807
6. Step 6: Final answer
   x = 3,600.09