Finding the Fourth Proportional to 21,113.33, 29,131.82 and 13,459.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,113.33 : 29,131.82 = 13,459.50 : x
2. Step 2: Convert to fraction form
   21,113.33/29,131.82 = 13,459.50/x
3. Step 3: Cross multiply
   21,113.33x = 29,131.82 × 13,459.50
4. Step 4: Simplify right side
   21,113.33x = 392,099,663.99
5. Step 5: Solve for x
   x = 392,099,663.99/21,113.33
6. Step 6: Final answer
   x = 18,571.19