Finding the Fourth Proportional to 21,175.55, 31,758.86 and 13,656.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,175.55 : 31,758.86 = 13,656.59 : x
2. Step 2: Convert to fraction form
   21,175.55/31,758.86 = 13,656.59/x
3. Step 3: Cross multiply
   21,175.55x = 31,758.86 × 13,656.59
4. Step 4: Simplify right side
   21,175.55x = 433,717,605.23
5. Step 5: Solve for x
   x = 433,717,605.23/21,175.55
6. Step 6: Final answer
   x = 20,482.00