Finding the Fourth Proportional to 9,411.23, 12,987.37 and 5,162.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.23 : 12,987.37 = 5,162.15 : x
2. Step 2: Convert to fraction form
   9,411.23/12,987.37 = 5,162.15/x
3. Step 3: Cross multiply
   9,411.23x = 12,987.37 × 5,162.15
4. Step 4: Simplify right side
   9,411.23x = 67,042,752.05
5. Step 5: Solve for x
   x = 67,042,752.05/9,411.23
6. Step 6: Final answer
   x = 7,123.70