Finding the Fourth Proportional to 21,186.16, 31,759.34 and 7,136.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,186.16 : 31,759.34 = 7,136.35 : x
2. Step 2: Convert to fraction form
   21,186.16/31,759.34 = 7,136.35/x
3. Step 3: Cross multiply
   21,186.16x = 31,759.34 × 7,136.35
4. Step 4: Simplify right side
   21,186.16x = 226,645,869.72
5. Step 5: Solve for x
   x = 226,645,869.72/21,186.16
6. Step 6: Final answer
   x = 10,697.83