Finding the Fourth Proportional to 31,374.72, 47,069.28 and 12,906.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,374.72 : 47,069.28 = 12,906.72 : x
2. Step 2: Convert to fraction form
   31,374.72/47,069.28 = 12,906.72/x
3. Step 3: Cross multiply
   31,374.72x = 47,069.28 × 12,906.72
4. Step 4: Simplify right side
   31,374.72x = 607,510,017.56
5. Step 5: Solve for x
   x = 607,510,017.56/31,374.72
6. Step 6: Final answer
   x = 19,363.04