Finding the Fourth Proportional to 21,312.27, 29,429.51 and 13,368.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,312.27 : 29,429.51 = 13,368.15 : x
2. Step 2: Convert to fraction form
   21,312.27/29,429.51 = 13,368.15/x
3. Step 3: Cross multiply
   21,312.27x = 29,429.51 × 13,368.15
4. Step 4: Simplify right side
   21,312.27x = 393,418,037.27
5. Step 5: Solve for x
   x = 393,418,037.27/21,312.27
6. Step 6: Final answer
   x = 18,459.70