Finding the Fourth Proportional to 31,578.78, 47,327.16 and 12,837

Step by Step Solution

1. Step 1: Write the proportion equation
   31,578.78 : 47,327.16 = 12,837 : x
2. Step 2: Convert to fraction form
   31,578.78/47,327.16 = 12,837/x
3. Step 3: Cross multiply
   31,578.78x = 47,327.16 × 12,837
4. Step 4: Simplify right side
   31,578.78x = 607,538,752.92
5. Step 5: Solve for x
   x = 607,538,752.92/31,578.78
6. Step 6: Final answer
   x = 19,238.83