Finding the Fourth Proportional to 21,162.48, 29,205 and 12,777.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.48 : 29,205 = 12,777.36 : x
2. Step 2: Convert to fraction form
   21,162.48/29,205 = 12,777.36/x
3. Step 3: Cross multiply
   21,162.48x = 29,205 × 12,777.36
4. Step 4: Simplify right side
   21,162.48x = 373,162,798.80
5. Step 5: Solve for x
   x = 373,162,798.80/21,162.48
6. Step 6: Final answer
   x = 17,633.23