Finding the Fourth Proportional to 9,057.79, 12,498.40 and 5,176.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,057.79 : 12,498.40 = 5,176.91 : x
2. Step 2: Convert to fraction form
   9,057.79/12,498.40 = 5,176.91/x
3. Step 3: Cross multiply
   9,057.79x = 12,498.40 × 5,176.91
4. Step 4: Simplify right side
   9,057.79x = 64,703,091.94
5. Step 5: Solve for x
   x = 64,703,091.94/9,057.79
6. Step 6: Final answer
   x = 7,143.36