Finding the Fourth Proportional to 13,158.18, 18,157.98 and 7,189.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.18 : 18,157.98 = 7,189.86 : x
2. Step 2: Convert to fraction form
   13,158.18/18,157.98 = 7,189.86/x
3. Step 3: Cross multiply
   13,158.18x = 18,157.98 × 7,189.86
4. Step 4: Simplify right side
   13,158.18x = 130,553,334.08
5. Step 5: Solve for x
   x = 130,553,334.08/13,158.18
6. Step 6: Final answer
   x = 9,921.84