Finding the Fourth Proportional to 31,908, 47,869.72 and 10,020

Step by Step Solution

1. Step 1: Write the proportion equation
   31,908 : 47,869.72 = 10,020 : x
2. Step 2: Convert to fraction form
   31,908/47,869.72 = 10,020/x
3. Step 3: Cross multiply
   31,908x = 47,869.72 × 10,020
4. Step 4: Simplify right side
   31,908x = 479,654,594.40
5. Step 5: Solve for x
   x = 479,654,594.40/31,908
6. Step 6: Final answer
   x = 15,032.42