Finding the Fourth Proportional to 12,993, 17,930.40 and 7,405.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,993 : 17,930.40 = 7,405.08 : x
2. Step 2: Convert to fraction form
   12,993/17,930.40 = 7,405.08/x
3. Step 3: Cross multiply
   12,993x = 17,930.40 × 7,405.08
4. Step 4: Simplify right side
   12,993x = 132,776,046.43
5. Step 5: Solve for x
   x = 132,776,046.43/12,993
6. Step 6: Final answer
   x = 10,219.04