Finding the Fourth Proportional to 12,942.31, 17,861.01 and 7,278.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942.31 : 17,861.01 = 7,278.84 : x
2. Step 2: Convert to fraction form
   12,942.31/17,861.01 = 7,278.84/x
3. Step 3: Cross multiply
   12,942.31x = 17,861.01 × 7,278.84
4. Step 4: Simplify right side
   12,942.31x = 130,007,434.03
5. Step 5: Solve for x
   x = 130,007,434.03/12,942.31
6. Step 6: Final answer
   x = 10,045.15