Finding the Fourth Proportional to 31,478.72, 47,200.81 and 12,484.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,478.72 : 47,200.81 = 12,484.12 : x
2. Step 2: Convert to fraction form
   31,478.72/47,200.81 = 12,484.12/x
3. Step 3: Cross multiply
   31,478.72x = 47,200.81 × 12,484.12
4. Step 4: Simplify right side
   31,478.72x = 589,260,576.14
5. Step 5: Solve for x
   x = 589,260,576.14/31,478.72
6. Step 6: Final answer
   x = 18,719.33