Finding the Fourth Proportional to 9,058.79, 12,499.78 and 5,177.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,058.79 : 12,499.78 = 5,177.91 : x
2. Step 2: Convert to fraction form
   9,058.79/12,499.78 = 5,177.91/x
3. Step 3: Cross multiply
   9,058.79x = 12,499.78 × 5,177.91
4. Step 4: Simplify right side
   9,058.79x = 64,722,735.86
5. Step 5: Solve for x
   x = 64,722,735.86/9,058.79
6. Step 6: Final answer
   x = 7,144.74