Finding the Fourth Proportional to 31,459.92, 47,178.54 and 10,678.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,459.92 : 47,178.54 = 10,678.56 : x
2. Step 2: Convert to fraction form
   31,459.92/47,178.54 = 10,678.56/x
3. Step 3: Cross multiply
   31,459.92x = 47,178.54 × 10,678.56
4. Step 4: Simplify right side
   31,459.92x = 503,798,870.10
5. Step 5: Solve for x
   x = 503,798,870.10/31,459.92
6. Step 6: Final answer
   x = 16,013.99