Finding the Fourth Proportional to 21,016.26, 28,980.18 and 18,900.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.26 : 28,980.18 = 18,900.18 : x
2. Step 2: Convert to fraction form
   21,016.26/28,980.18 = 18,900.18/x
3. Step 3: Cross multiply
   21,016.26x = 28,980.18 × 18,900.18
4. Step 4: Simplify right side
   21,016.26x = 547,730,618.43
5. Step 5: Solve for x
   x = 547,730,618.43/21,016.26
6. Step 6: Final answer
   x = 26,062.23