Finding the Fourth Proportional to 11,978.86, 17,974.38 and 5,403.58

Step by Step Solution

1. Step 1: Write the proportion equation
   11,978.86 : 17,974.38 = 5,403.58 : x
2. Step 2: Convert to fraction form
   11,978.86/17,974.38 = 5,403.58/x
3. Step 3: Cross multiply
   11,978.86x = 17,974.38 × 5,403.58
4. Step 4: Simplify right side
   11,978.86x = 97,126,000.28
5. Step 5: Solve for x
   x = 97,126,000.28/11,978.86
6. Step 6: Final answer
   x = 8,108.12