Finding the Fourth Proportional to 21,595.12, 29,808.72 and 12,645.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,595.12 : 29,808.72 = 12,645.50 : x
2. Step 2: Convert to fraction form
   21,595.12/29,808.72 = 12,645.50/x
3. Step 3: Cross multiply
   21,595.12x = 29,808.72 × 12,645.50
4. Step 4: Simplify right side
   21,595.12x = 376,946,168.76
5. Step 5: Solve for x
   x = 376,946,168.76/21,595.12
6. Step 6: Final answer
   x = 17,455.16