Finding the Fourth Proportional to 13,005.25, 17,939.95 and 7,971.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,005.25 : 17,939.95 = 7,971.91 : x
2. Step 2: Convert to fraction form
   13,005.25/17,939.95 = 7,971.91/x
3. Step 3: Cross multiply
   13,005.25x = 17,939.95 × 7,971.91
4. Step 4: Simplify right side
   13,005.25x = 143,015,666.80
5. Step 5: Solve for x
   x = 143,015,666.80/13,005.25
6. Step 6: Final answer
   x = 10,996.76