Finding the Fourth Proportional to 21,020.63, 31,527.17 and 5,437.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,020.63 : 31,527.17 = 5,437.31 : x
2. Step 2: Convert to fraction form
   21,020.63/31,527.17 = 5,437.31/x
3. Step 3: Cross multiply
   21,020.63x = 31,527.17 × 5,437.31
4. Step 4: Simplify right side
   21,020.63x = 171,422,969.53
5. Step 5: Solve for x
   x = 171,422,969.53/21,020.63
6. Step 6: Final answer
   x = 8,154.99