Finding the Fourth Proportional to 31,890.72, 47,838.06 and 9,705.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,890.72 : 47,838.06 = 9,705.72 : x
2. Step 2: Convert to fraction form
   31,890.72/47,838.06 = 9,705.72/x
3. Step 3: Cross multiply
   31,890.72x = 47,838.06 × 9,705.72
4. Step 4: Simplify right side
   31,890.72x = 464,302,815.70
5. Step 5: Solve for x
   x = 464,302,815.70/31,890.72
6. Step 6: Final answer
   x = 14,559.18