Finding the Fourth Proportional to 11,699.86, 17,561.94 and 7,831.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,699.86 : 17,561.94 = 7,831.30 : x
2. Step 2: Convert to fraction form
   11,699.86/17,561.94 = 7,831.30/x
3. Step 3: Cross multiply
   11,699.86x = 17,561.94 × 7,831.30
4. Step 4: Simplify right side
   11,699.86x = 137,532,820.72
5. Step 5: Solve for x
   x = 137,532,820.72/11,699.86
6. Step 6: Final answer
   x = 11,755.08