Finding the Fourth Proportional to 12,958.87, 17,877.61 and 7,923.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,958.87 : 17,877.61 = 7,923.30 : x
2. Step 2: Convert to fraction form
   12,958.87/17,877.61 = 7,923.30/x
3. Step 3: Cross multiply
   12,958.87x = 17,877.61 × 7,923.30
4. Step 4: Simplify right side
   12,958.87x = 141,649,647.50
5. Step 5: Solve for x
   x = 141,649,647.50/12,958.87
6. Step 6: Final answer
   x = 10,930.71