Finding the Fourth Proportional to 12,026.81, 16,596.50 and 6,990.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,026.81 : 16,596.50 = 6,990.78 : x
2. Step 2: Convert to fraction form
   12,026.81/16,596.50 = 6,990.78/x
3. Step 3: Cross multiply
   12,026.81x = 16,596.50 × 6,990.78
4. Step 4: Simplify right side
   12,026.81x = 116,022,445.32
5. Step 5: Solve for x
   x = 116,022,445.32/12,026.81
6. Step 6: Final answer
   x = 9,646.99