Finding the Fourth Proportional to 21,150.76, 29,188.05 and 12,653.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.76 : 29,188.05 = 12,653.23 : x
2. Step 2: Convert to fraction form
   21,150.76/29,188.05 = 12,653.23/x
3. Step 3: Cross multiply
   21,150.76x = 29,188.05 × 12,653.23
4. Step 4: Simplify right side
   21,150.76x = 369,323,109.90
5. Step 5: Solve for x
   x = 369,323,109.90/21,150.76
6. Step 6: Final answer
   x = 17,461.46