Finding the Fourth Proportional to 12,391.23, 17,099.31 and 7,013.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391.23 : 17,099.31 = 7,013.91 : x
2. Step 2: Convert to fraction form
   12,391.23/17,099.31 = 7,013.91/x
3. Step 3: Cross multiply
   12,391.23x = 17,099.31 × 7,013.91
4. Step 4: Simplify right side
   12,391.23x = 119,933,021.40
5. Step 5: Solve for x
   x = 119,933,021.40/12,391.23
6. Step 6: Final answer
   x = 9,678.86