Finding the Fourth Proportional to 21,300.59, 29,388.57 and 13,751.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,300.59 : 29,388.57 = 13,751.39 : x
2. Step 2: Convert to fraction form
   21,300.59/29,388.57 = 13,751.39/x
3. Step 3: Cross multiply
   21,300.59x = 29,388.57 × 13,751.39
4. Step 4: Simplify right side
   21,300.59x = 404,133,687.61
5. Step 5: Solve for x
   x = 404,133,687.61/21,300.59
6. Step 6: Final answer
   x = 18,972.89