Finding the Fourth Proportional to 21,471, 29,632.60 and 13,513.08

Step by Step Solution

1. Step 1: Write the proportion equation
   21,471 : 29,632.60 = 13,513.08 : x
2. Step 2: Convert to fraction form
   21,471/29,632.60 = 13,513.08/x
3. Step 3: Cross multiply
   21,471x = 29,632.60 × 13,513.08
4. Step 4: Simplify right side
   21,471x = 400,427,694.41
5. Step 5: Solve for x
   x = 400,427,694.41/21,471
6. Step 6: Final answer
   x = 18,649.70