Finding the Fourth Proportional to 9,411.89, 12,987.56 and 5,162.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.89 : 12,987.56 = 5,162.77 : x
2. Step 2: Convert to fraction form
   9,411.89/12,987.56 = 5,162.77/x
3. Step 3: Cross multiply
   9,411.89x = 12,987.56 × 5,162.77
4. Step 4: Simplify right side
   9,411.89x = 67,051,694.39
5. Step 5: Solve for x
   x = 67,051,694.39/9,411.89
6. Step 6: Final answer
   x = 7,124.15