Finding the Fourth Proportional to 9,388.84, 12,956.50 and 5,139.85

Step by Step Solution

1. Step 1: Write the proportion equation
   9,388.84 : 12,956.50 = 5,139.85 : x
2. Step 2: Convert to fraction form
   9,388.84/12,956.50 = 5,139.85/x
3. Step 3: Cross multiply
   9,388.84x = 12,956.50 × 5,139.85
4. Step 4: Simplify right side
   9,388.84x = 66,594,466.53
5. Step 5: Solve for x
   x = 66,594,466.53/9,388.84
6. Step 6: Final answer
   x = 7,092.94