Finding the Fourth Proportional to 31,426.67, 47,129.99 and 10,362.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,426.67 : 47,129.99 = 10,362.78 : x
2. Step 2: Convert to fraction form
   31,426.67/47,129.99 = 10,362.78/x
3. Step 3: Cross multiply
   31,426.67x = 47,129.99 × 10,362.78
4. Step 4: Simplify right side
   31,426.67x = 488,397,665.96
5. Step 5: Solve for x
   x = 488,397,665.96/31,426.67
6. Step 6: Final answer
   x = 15,540.87