Finding the Fourth Proportional to 21,010.82, 28,982.18 and 12,507.26

Step by Step Solution

1. Step 1: Write the proportion equation
   21,010.82 : 28,982.18 = 12,507.26 : x
2. Step 2: Convert to fraction form
   21,010.82/28,982.18 = 12,507.26/x
3. Step 3: Cross multiply
   21,010.82x = 28,982.18 × 12,507.26
4. Step 4: Simplify right side
   21,010.82x = 362,487,453.18
5. Step 5: Solve for x
   x = 362,487,453.18/21,010.82
6. Step 6: Final answer
   x = 17,252.42