Finding the Fourth Proportional to 21,891.94, 30,210.91 and 12,460.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,891.94 : 30,210.91 = 12,460.50 : x
2. Step 2: Convert to fraction form
   21,891.94/30,210.91 = 12,460.50/x
3. Step 3: Cross multiply
   21,891.94x = 30,210.91 × 12,460.50
4. Step 4: Simplify right side
   21,891.94x = 376,443,012.90
5. Step 5: Solve for x
   x = 376,443,012.90/21,891.94
6. Step 6: Final answer
   x = 17,195.51