Finding the Fourth Proportional to 21,075.85, 29,094.15 and 13,422.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,075.85 : 29,094.15 = 13,422.43 : x
2. Step 2: Convert to fraction form
   21,075.85/29,094.15 = 13,422.43/x
3. Step 3: Cross multiply
   21,075.85x = 29,094.15 × 13,422.43
4. Step 4: Simplify right side
   21,075.85x = 390,514,191.78
5. Step 5: Solve for x
   x = 390,514,191.78/21,075.85
6. Step 6: Final answer
   x = 18,528.99