Finding the Fourth Proportional to 10,591, 15,939.72 and 7,972.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,591 : 15,939.72 = 7,972.08 : x
2. Step 2: Convert to fraction form
   10,591/15,939.72 = 7,972.08/x
3. Step 3: Cross multiply
   10,591x = 15,939.72 × 7,972.08
4. Step 4: Simplify right side
   10,591x = 127,072,723.02
5. Step 5: Solve for x
   x = 127,072,723.02/10,591
6. Step 6: Final answer
   x = 11,998.18