Finding the Fourth Proportional to 28,272.72, 42,420.12 and 10,514.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,272.72 : 42,420.12 = 10,514.28 : x
2. Step 2: Convert to fraction form
   28,272.72/42,420.12 = 10,514.28/x
3. Step 3: Cross multiply
   28,272.72x = 42,420.12 × 10,514.28
4. Step 4: Simplify right side
   28,272.72x = 446,017,019.31
5. Step 5: Solve for x
   x = 446,017,019.31/28,272.72
6. Step 6: Final answer
   x = 15,775.53