Finding the Fourth Proportional to 21,570.27, 29,762.40 and 13,607.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,570.27 : 29,762.40 = 13,607.88 : x
2. Step 2: Convert to fraction form
   21,570.27/29,762.40 = 13,607.88/x
3. Step 3: Cross multiply
   21,570.27x = 29,762.40 × 13,607.88
4. Step 4: Simplify right side
   21,570.27x = 405,003,167.71
5. Step 5: Solve for x
   x = 405,003,167.71/21,570.27
6. Step 6: Final answer
   x = 18,775.99