Finding the Fourth Proportional to 12,990.56, 19,487.56 and 4,222.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.56 : 19,487.56 = 4,222.50 : x
2. Step 2: Convert to fraction form
   12,990.56/19,487.56 = 4,222.50/x
3. Step 3: Cross multiply
   12,990.56x = 19,487.56 × 4,222.50
4. Step 4: Simplify right side
   12,990.56x = 82,286,222.10
5. Step 5: Solve for x
   x = 82,286,222.10/12,990.56
6. Step 6: Final answer
   x = 6,334.31