Finding the Fourth Proportional to 9,155.72, 12,634.70 and 5,176.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,155.72 : 12,634.70 = 5,176.74 : x
2. Step 2: Convert to fraction form
   9,155.72/12,634.70 = 5,176.74/x
3. Step 3: Cross multiply
   9,155.72x = 12,634.70 × 5,176.74
4. Step 4: Simplify right side
   9,155.72x = 65,406,556.88
5. Step 5: Solve for x
   x = 65,406,556.88/9,155.72
6. Step 6: Final answer
   x = 7,143.79