Finding the Fourth Proportional to 9,157.95, 12,638.04 and 5,380.35

Step by Step Solution

1. Step 1: Write the proportion equation
   9,157.95 : 12,638.04 = 5,380.35 : x
2. Step 2: Convert to fraction form
   9,157.95/12,638.04 = 5,380.35/x
3. Step 3: Cross multiply
   9,157.95x = 12,638.04 × 5,380.35
4. Step 4: Simplify right side
   9,157.95x = 67,997,078.51
5. Step 5: Solve for x
   x = 67,997,078.51/9,157.95
6. Step 6: Final answer
   x = 7,424.92