Finding the Fourth Proportional to 21,075.61, 29,081.85 and 12,576.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,075.61 : 29,081.85 = 12,576.15 : x
2. Step 2: Convert to fraction form
   21,075.61/29,081.85 = 12,576.15/x
3. Step 3: Cross multiply
   21,075.61x = 29,081.85 × 12,576.15
4. Step 4: Simplify right side
   21,075.61x = 365,737,816.93
5. Step 5: Solve for x
   x = 365,737,816.93/21,075.61
6. Step 6: Final answer
   x = 17,353.61