Finding the Fourth Proportional to 21,300.44, 29,384.78 and 13,328.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.44 : 29,384.78 = 13,328.82 : x
2. Step 2: Convert to fraction form
   21,300.44/29,384.78 = 13,328.82/x
3. Step 3: Cross multiply
   21,300.44x = 29,384.78 × 13,328.82
4. Step 4: Simplify right side
   21,300.44x = 391,664,376.72
5. Step 5: Solve for x
   x = 391,664,376.72/21,300.44
6. Step 6: Final answer
   x = 18,387.62