Finding the Fourth Proportional to 12,993.88, 17,931.72 and 7,405.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,993.88 : 17,931.72 = 7,405.24 : x
2. Step 2: Convert to fraction form
   12,993.88/17,931.72 = 7,405.24/x
3. Step 3: Cross multiply
   12,993.88x = 17,931.72 × 7,405.24
4. Step 4: Simplify right side
   12,993.88x = 132,788,690.21
5. Step 5: Solve for x
   x = 132,788,690.21/12,993.88
6. Step 6: Final answer
   x = 10,219.33