Finding the Fourth Proportional to 12,985, 17,922.54 and 7,399.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,985 : 17,922.54 = 7,399.24 : x
2. Step 2: Convert to fraction form
   12,985/17,922.54 = 7,399.24/x
3. Step 3: Cross multiply
   12,985x = 17,922.54 × 7,399.24
4. Step 4: Simplify right side
   12,985x = 132,613,174.87
5. Step 5: Solve for x
   x = 132,613,174.87/12,985
6. Step 6: Final answer
   x = 10,212.80