Finding the Fourth Proportional to 21,036.70, 31,570.69 and 9,946.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,036.70 : 31,570.69 = 9,946.79 : x
2. Step 2: Convert to fraction form
   21,036.70/31,570.69 = 9,946.79/x
3. Step 3: Cross multiply
   21,036.70x = 31,570.69 × 9,946.79
4. Step 4: Simplify right side
   21,036.70x = 314,027,023.59
5. Step 5: Solve for x
   x = 314,027,023.59/21,036.70
6. Step 6: Final answer
   x = 14,927.58