Finding the Fourth Proportional to 6,428.82, 8,870.16 and 4,039.17

Step by Step Solution

1. Step 1: Write the proportion equation
   6,428.82 : 8,870.16 = 4,039.17 : x
2. Step 2: Convert to fraction form
   6,428.82/8,870.16 = 4,039.17/x
3. Step 3: Cross multiply
   6,428.82x = 8,870.16 × 4,039.17
4. Step 4: Simplify right side
   6,428.82x = 35,828,043.33
5. Step 5: Solve for x
   x = 35,828,043.33/6,428.82
6. Step 6: Final answer
   x = 5,573.04