Finding the Fourth Proportional to 21,889.72, 30,208.98 and 12,461.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,889.72 : 30,208.98 = 12,461.32 : x
2. Step 2: Convert to fraction form
   21,889.72/30,208.98 = 12,461.32/x
3. Step 3: Cross multiply
   21,889.72x = 30,208.98 × 12,461.32
4. Step 4: Simplify right side
   21,889.72x = 376,443,766.65
5. Step 5: Solve for x
   x = 376,443,766.65/21,889.72
6. Step 6: Final answer
   x = 17,197.29