Finding the Fourth Proportional to 12,999.50, 17,939.32 and 7,335.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,999.50 : 17,939.32 = 7,335.45 : x
2. Step 2: Convert to fraction form
   12,999.50/17,939.32 = 7,335.45/x
3. Step 3: Cross multiply
   12,999.50x = 17,939.32 × 7,335.45
4. Step 4: Simplify right side
   12,999.50x = 131,592,984.89
5. Step 5: Solve for x
   x = 131,592,984.89/12,999.50
6. Step 6: Final answer
   x = 10,122.93