Finding the Fourth Proportional to 21,051.99, 31,561.43 and 10,516.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,051.99 : 31,561.43 = 10,516.58 : x
2. Step 2: Convert to fraction form
   21,051.99/31,561.43 = 10,516.58/x
3. Step 3: Cross multiply
   21,051.99x = 31,561.43 × 10,516.58
4. Step 4: Simplify right side
   21,051.99x = 331,918,093.12
5. Step 5: Solve for x
   x = 331,918,093.12/21,051.99
6. Step 6: Final answer
   x = 15,766.59