Finding the Fourth Proportional to 21,065.24, 31,607.03 and 12,300.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,065.24 : 31,607.03 = 12,300.16 : x
2. Step 2: Convert to fraction form
   21,065.24/31,607.03 = 12,300.16/x
3. Step 3: Cross multiply
   21,065.24x = 31,607.03 × 12,300.16
4. Step 4: Simplify right side
   21,065.24x = 388,771,526.12
5. Step 5: Solve for x
   x = 388,771,526.12/21,065.24
6. Step 6: Final answer
   x = 18,455.59