Finding the Fourth Proportional to 21,628.50, 32,442.78 and 5,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,628.50 : 32,442.78 = 5,212.50 : x
2. Step 2: Convert to fraction form
   21,628.50/32,442.78 = 5,212.50/x
3. Step 3: Cross multiply
   21,628.50x = 32,442.78 × 5,212.50
4. Step 4: Simplify right side
   21,628.50x = 169,107,990.75
5. Step 5: Solve for x
   x = 169,107,990.75/21,628.50
6. Step 6: Final answer
   x = 7,818.76