Finding the Fourth Proportional to 31,618.56, 47,406.72 and 12,630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,618.56 : 47,406.72 = 12,630.72 : x
2. Step 2: Convert to fraction form
   31,618.56/47,406.72 = 12,630.72/x
3. Step 3: Cross multiply
   31,618.56x = 47,406.72 × 12,630.72
4. Step 4: Simplify right side
   31,618.56x = 598,781,006.44
5. Step 5: Solve for x
   x = 598,781,006.44/31,618.56
6. Step 6: Final answer
   x = 18,937.64