Finding the Fourth Proportional to 12,971.85, 17,902.50 and 7,939.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,971.85 : 17,902.50 = 7,939.42 : x
2. Step 2: Convert to fraction form
   12,971.85/17,902.50 = 7,939.42/x
3. Step 3: Cross multiply
   12,971.85x = 17,902.50 × 7,939.42
4. Step 4: Simplify right side
   12,971.85x = 142,135,392.02
5. Step 5: Solve for x
   x = 142,135,392.02/12,971.85
6. Step 6: Final answer
   x = 10,957.22