Finding the Fourth Proportional to 3,111.77, 4,299.71 and 2,487.45

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.77 : 4,299.71 = 2,487.45 : x
2. Step 2: Convert to fraction form
   3,111.77/4,299.71 = 2,487.45/x
3. Step 3: Cross multiply
   3,111.77x = 4,299.71 × 2,487.45
4. Step 4: Simplify right side
   3,111.77x = 10,695,313.64
5. Step 5: Solve for x
   x = 10,695,313.64/3,111.77
6. Step 6: Final answer
   x = 3,437.05