Finding the Fourth Proportional to 21,626.50, 32,439.78 and 5,210.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,626.50 : 32,439.78 = 5,210.50 : x
2. Step 2: Convert to fraction form
   21,626.50/32,439.78 = 5,210.50/x
3. Step 3: Cross multiply
   21,626.50x = 32,439.78 × 5,210.50
4. Step 4: Simplify right side
   21,626.50x = 169,027,473.69
5. Step 5: Solve for x
   x = 169,027,473.69/21,626.50
6. Step 6: Final answer
   x = 7,815.76