Finding the Fourth Proportional to 12,385.76, 17,094.38 and 7,911.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,385.76 : 17,094.38 = 7,911.72 : x
2. Step 2: Convert to fraction form
   12,385.76/17,094.38 = 7,911.72/x
3. Step 3: Cross multiply
   12,385.76x = 17,094.38 × 7,911.72
4. Step 4: Simplify right side
   12,385.76x = 135,245,908.58
5. Step 5: Solve for x
   x = 135,245,908.58/12,385.76
6. Step 6: Final answer
   x = 10,919.47