Finding the Fourth Proportional to 9,156.23, 12,636.05 and 5,379.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,156.23 : 12,636.05 = 5,379.60 : x
2. Step 2: Convert to fraction form
   9,156.23/12,636.05 = 5,379.60/x
3. Step 3: Cross multiply
   9,156.23x = 12,636.05 × 5,379.60
4. Step 4: Simplify right side
   9,156.23x = 67,976,867.68
5. Step 5: Solve for x
   x = 67,976,867.68/9,156.23
6. Step 6: Final answer
   x = 7,424.12