Finding the Fourth Proportional to 8,539.84, 12,789.12 and 7,068.16

Step by Step Solution

1. Step 1: Write the proportion equation
   8,539.84 : 12,789.12 = 7,068.16 : x
2. Step 2: Convert to fraction form
   8,539.84/12,789.12 = 7,068.16/x
3. Step 3: Cross multiply
   8,539.84x = 12,789.12 × 7,068.16
4. Step 4: Simplify right side
   8,539.84x = 90,395,546.42
5. Step 5: Solve for x
   x = 90,395,546.42/8,539.84
6. Step 6: Final answer
   x = 10,585.16