Finding the Fourth Proportional to 21,006.32, 31,507.04 and 5,422.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,006.32 : 31,507.04 = 5,422.72 : x
2. Step 2: Convert to fraction form
   21,006.32/31,507.04 = 5,422.72/x
3. Step 3: Cross multiply
   21,006.32x = 31,507.04 × 5,422.72
4. Step 4: Simplify right side
   21,006.32x = 170,853,855.95
5. Step 5: Solve for x
   x = 170,853,855.95/21,006.32
6. Step 6: Final answer
   x = 8,133.45