Finding the Fourth Proportional to 12,990.10, 17,926.54 and 7,400.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.10 : 17,926.54 = 7,400.98 : x
2. Step 2: Convert to fraction form
   12,990.10/17,926.54 = 7,400.98/x
3. Step 3: Cross multiply
   12,990.10x = 17,926.54 × 7,400.98
4. Step 4: Simplify right side
   12,990.10x = 132,673,964.01
5. Step 5: Solve for x
   x = 132,673,964.01/12,990.10
6. Step 6: Final answer
   x = 10,213.47