Finding the Fourth Proportional to 13,158.86, 18,158.71 and 7,190.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.86 : 18,158.71 = 7,190.60 : x
2. Step 2: Convert to fraction form
   13,158.86/18,158.71 = 7,190.60/x
3. Step 3: Cross multiply
   13,158.86x = 18,158.71 × 7,190.60
4. Step 4: Simplify right side
   13,158.86x = 130,571,955.69
5. Step 5: Solve for x
   x = 130,571,955.69/13,158.86
6. Step 6: Final answer
   x = 9,922.74