Finding the Fourth Proportional to 12,939.29, 17,856.14 and 7,902.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.29 : 17,856.14 = 7,902.81 : x
2. Step 2: Convert to fraction form
   12,939.29/17,856.14 = 7,902.81/x
3. Step 3: Cross multiply
   12,939.29x = 17,856.14 × 7,902.81
4. Step 4: Simplify right side
   12,939.29x = 141,113,604.91
5. Step 5: Solve for x
   x = 141,113,604.91/12,939.29
6. Step 6: Final answer
   x = 10,905.83