Finding the Fourth Proportional to 21,904.32, 30,196.50 and 15,605.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,904.32 : 30,196.50 = 15,605.76 : x
2. Step 2: Convert to fraction form
   21,904.32/30,196.50 = 15,605.76/x
3. Step 3: Cross multiply
   21,904.32x = 30,196.50 × 15,605.76
4. Step 4: Simplify right side
   21,904.32x = 471,239,386.56
5. Step 5: Solve for x
   x = 471,239,386.56/21,904.32
6. Step 6: Final answer
   x = 21,513.53