Finding the Fourth Proportional to 12,990.50, 17,926.89 and 8,022.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.50 : 17,926.89 = 8,022.50 : x
2. Step 2: Convert to fraction form
   12,990.50/17,926.89 = 8,022.50/x
3. Step 3: Cross multiply
   12,990.50x = 17,926.89 × 8,022.50
4. Step 4: Simplify right side
   12,990.50x = 143,818,475.03
5. Step 5: Solve for x
   x = 143,818,475.03/12,990.50
6. Step 6: Final answer
   x = 11,071.05