Finding the Fourth Proportional to 9,788.34, 13,494.69 and 6,639.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,788.34 : 13,494.69 = 6,639.06 : x
2. Step 2: Convert to fraction form
   9,788.34/13,494.69 = 6,639.06/x
3. Step 3: Cross multiply
   9,788.34x = 13,494.69 × 6,639.06
4. Step 4: Simplify right side
   9,788.34x = 89,592,056.59
5. Step 5: Solve for x
   x = 89,592,056.59/9,788.34
6. Step 6: Final answer
   x = 9,152.94