Finding the Fourth Proportional to 13,158.37, 18,157.89 and 7,188.94

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.37 : 18,157.89 = 7,188.94 : x
2. Step 2: Convert to fraction form
   13,158.37/18,157.89 = 7,188.94/x
3. Step 3: Cross multiply
   13,158.37x = 18,157.89 × 7,188.94
4. Step 4: Simplify right side
   13,158.37x = 130,535,981.74
5. Step 5: Solve for x
   x = 130,535,981.74/13,158.37
6. Step 6: Final answer
   x = 9,920.38