Finding the Fourth Proportional to 21,048.61, 29,047.15 and 11,488.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,048.61 : 29,047.15 = 11,488.59 : x
2. Step 2: Convert to fraction form
   21,048.61/29,047.15 = 11,488.59/x
3. Step 3: Cross multiply
   21,048.61x = 29,047.15 × 11,488.59
4. Step 4: Simplify right side
   21,048.61x = 333,710,797.02
5. Step 5: Solve for x
   x = 333,710,797.02/21,048.61
6. Step 6: Final answer
   x = 15,854.29