Finding the Fourth Proportional to 21,473.34, 29,619.57 and 15,513.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,473.34 : 29,619.57 = 15,513.76 : x
2. Step 2: Convert to fraction form
   21,473.34/29,619.57 = 15,513.76/x
3. Step 3: Cross multiply
   21,473.34x = 29,619.57 × 15,513.76
4. Step 4: Simplify right side
   21,473.34x = 459,510,900.28
5. Step 5: Solve for x
   x = 459,510,900.28/21,473.34
6. Step 6: Final answer
   x = 21,399.13