Finding the Fourth Proportional to 21,009.42, 31,514.67 and 5,427

Step by Step Solution

1. Step 1: Write the proportion equation
   21,009.42 : 31,514.67 = 5,427 : x
2. Step 2: Convert to fraction form
   21,009.42/31,514.67 = 5,427/x
3. Step 3: Cross multiply
   21,009.42x = 31,514.67 × 5,427
4. Step 4: Simplify right side
   21,009.42x = 171,030,114.09
5. Step 5: Solve for x
   x = 171,030,114.09/21,009.42
6. Step 6: Final answer
   x = 8,140.64