Finding the Fourth Proportional to 21,656.58, 29,886.57 and 12,710.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,656.58 : 29,886.57 = 12,710.53 : x
2. Step 2: Convert to fraction form
   21,656.58/29,886.57 = 12,710.53/x
3. Step 3: Cross multiply
   21,656.58x = 29,886.57 × 12,710.53
4. Step 4: Simplify right side
   21,656.58x = 379,874,081.03
5. Step 5: Solve for x
   x = 379,874,081.03/21,656.58
6. Step 6: Final answer
   x = 17,540.82