Finding the Fourth Proportional to 21,570.13, 32,321.53 and 13,655.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,570.13 : 32,321.53 = 13,655.89 : x
2. Step 2: Convert to fraction form
   21,570.13/32,321.53 = 13,655.89/x
3. Step 3: Cross multiply
   21,570.13x = 32,321.53 × 13,655.89
4. Step 4: Simplify right side
   21,570.13x = 441,379,258.31
5. Step 5: Solve for x
   x = 441,379,258.31/21,570.13
6. Step 6: Final answer
   x = 20,462.52