Finding the Fourth Proportional to 13,158.62, 18,158.50 and 7,856.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,158.62 : 18,158.50 = 7,856.98 : x
2. Step 2: Convert to fraction form
   13,158.62/18,158.50 = 7,856.98/x
3. Step 3: Cross multiply
   13,158.62x = 18,158.50 × 7,856.98
4. Step 4: Simplify right side
   13,158.62x = 142,670,971.33
5. Step 5: Solve for x
   x = 142,670,971.33/13,158.62
6. Step 6: Final answer
   x = 10,842.40