Finding the Fourth Proportional to 21,002.58, 31,447.98 and 18,511.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.58 : 31,447.98 = 18,511.56 : x
2. Step 2: Convert to fraction form
   21,002.58/31,447.98 = 18,511.56/x
3. Step 3: Cross multiply
   21,002.58x = 31,447.98 × 18,511.56
4. Step 4: Simplify right side
   21,002.58x = 582,151,168.65
5. Step 5: Solve for x
   x = 582,151,168.65/21,002.58
6. Step 6: Final answer
   x = 27,718.08