Finding the Fourth Proportional to 21,117.51, 31,680.52 and 10,025.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,117.51 : 31,680.52 = 10,025.37 : x
2. Step 2: Convert to fraction form
   21,117.51/31,680.52 = 10,025.37/x
3. Step 3: Cross multiply
   21,117.51x = 31,680.52 × 10,025.37
4. Step 4: Simplify right side
   21,117.51x = 317,608,909.73
5. Step 5: Solve for x
   x = 317,608,909.73/21,117.51
6. Step 6: Final answer
   x = 15,040.07