Finding the Fourth Proportional to 11,997.51, 17,959.37 and 7,828.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,997.51 : 17,959.37 = 7,828.55 : x
2. Step 2: Convert to fraction form
   11,997.51/17,959.37 = 7,828.55/x
3. Step 3: Cross multiply
   11,997.51x = 17,959.37 × 7,828.55
4. Step 4: Simplify right side
   11,997.51x = 140,595,697.07
5. Step 5: Solve for x
   x = 140,595,697.07/11,997.51
6. Step 6: Final answer
   x = 11,718.74