Finding the Fourth Proportional to 8,118.42, 12,160.53 and 5,155.37

Step by Step Solution

1. Step 1: Write the proportion equation
   8,118.42 : 12,160.53 = 5,155.37 : x
2. Step 2: Convert to fraction form
   8,118.42/12,160.53 = 5,155.37/x
3. Step 3: Cross multiply
   8,118.42x = 12,160.53 × 5,155.37
4. Step 4: Simplify right side
   8,118.42x = 62,692,031.55
5. Step 5: Solve for x
   x = 62,692,031.55/8,118.42
6. Step 6: Final answer
   x = 7,722.20