Finding the Fourth Proportional to 21,061.76, 31,592.68 and 5,479.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.76 : 31,592.68 = 5,479.36 : x
2. Step 2: Convert to fraction form
   21,061.76/31,592.68 = 5,479.36/x
3. Step 3: Cross multiply
   21,061.76x = 31,592.68 × 5,479.36
4. Step 4: Simplify right side
   21,061.76x = 173,107,667.08
5. Step 5: Solve for x
   x = 173,107,667.08/21,061.76
6. Step 6: Final answer
   x = 8,219.05