Finding the Fourth Proportional to 12,994.83, 17,931.78 and 7,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,994.83 : 17,931.78 = 7,688.72 : x
2. Step 2: Convert to fraction form
   12,994.83/17,931.78 = 7,688.72/x
3. Step 3: Cross multiply
   12,994.83x = 17,931.78 × 7,688.72
4. Step 4: Simplify right side
   12,994.83x = 137,872,480.35
5. Step 5: Solve for x
   x = 137,872,480.35/12,994.83
6. Step 6: Final answer
   x = 10,609.79