Finding the Fourth Proportional to 21,061.32, 31,611.42 and 10,680.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.32 : 31,611.42 = 10,680.36 : x
2. Step 2: Convert to fraction form
   21,061.32/31,611.42 = 10,680.36/x
3. Step 3: Cross multiply
   21,061.32x = 31,611.42 × 10,680.36
4. Step 4: Simplify right side
   21,061.32x = 337,621,345.71
5. Step 5: Solve for x
   x = 337,621,345.71/21,061.32
6. Step 6: Final answer
   x = 16,030.40