Finding the Fourth Proportional to 21,298.59, 29,385.81 and 13,749.39

Step by Step Solution

1. Step 1: Write the proportion equation
   21,298.59 : 29,385.81 = 13,749.39 : x
2. Step 2: Convert to fraction form
   21,298.59/29,385.81 = 13,749.39/x
3. Step 3: Cross multiply
   21,298.59x = 29,385.81 × 13,749.39
4. Step 4: Simplify right side
   21,298.59x = 404,036,962.16
5. Step 5: Solve for x
   x = 404,036,962.16/21,298.59
6. Step 6: Final answer
   x = 18,970.13