Finding the Fourth Proportional to 139,086.86, 191,939.97 and 75,424.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,086.86 : 191,939.97 = 75,424.64 : x
2. Step 2: Convert to fraction form
   139,086.86/191,939.97 = 75,424.64/x
3. Step 3: Cross multiply
   139,086.86x = 191,939.97 × 75,424.64
4. Step 4: Simplify right side
   139,086.86x = 14,477,003,138.86
5. Step 5: Solve for x
   x = 14,477,003,138.86/139,086.86
6. Step 6: Final answer
   x = 104,086.06