Finding the Fourth Proportional to 21,505.10, 29,678.54 and 13,007.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,505.10 : 29,678.54 = 13,007.59 : x
2. Step 2: Convert to fraction form
   21,505.10/29,678.54 = 13,007.59/x
3. Step 3: Cross multiply
   21,505.10x = 29,678.54 × 13,007.59
4. Step 4: Simplify right side
   21,505.10x = 386,046,140.88
5. Step 5: Solve for x
   x = 386,046,140.88/21,505.10
6. Step 6: Final answer
   x = 17,951.38