Finding the Fourth Proportional to 9,157.35, 12,637.17 and 5,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,157.35 : 12,637.17 = 5,178.72 : x
2. Step 2: Convert to fraction form
   9,157.35/12,637.17 = 5,178.72/x
3. Step 3: Cross multiply
   9,157.35x = 12,637.17 × 5,178.72
4. Step 4: Simplify right side
   9,157.35x = 65,444,365.02
5. Step 5: Solve for x
   x = 65,444,365.02/9,157.35
6. Step 6: Final answer
   x = 7,146.65