Finding the Fourth Proportional to 6,111.99, 8,439.39 and 3,988.98

Step by Step Solution

1. Step 1: Write the proportion equation
   6,111.99 : 8,439.39 = 3,988.98 : x
2. Step 2: Convert to fraction form
   6,111.99/8,439.39 = 3,988.98/x
3. Step 3: Cross multiply
   6,111.99x = 8,439.39 × 3,988.98
4. Step 4: Simplify right side
   6,111.99x = 33,664,557.92
5. Step 5: Solve for x
   x = 33,664,557.92/6,111.99
6. Step 6: Final answer
   x = 5,507.95