Finding the Fourth Proportional to 31,578.81, 47,384.82 and 12,872.67

Step by Step Solution

1. Step 1: Write the proportion equation
   31,578.81 : 47,384.82 = 12,872.67 : x
2. Step 2: Convert to fraction form
   31,578.81/47,384.82 = 12,872.67/x
3. Step 3: Cross multiply
   31,578.81x = 47,384.82 × 12,872.67
4. Step 4: Simplify right side
   31,578.81x = 609,969,150.87
5. Step 5: Solve for x
   x = 609,969,150.87/31,578.81
6. Step 6: Final answer
   x = 19,315.77