Finding the Fourth Proportional to 139,769.39, 192,832.56 and 91,399.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,769.39 : 192,832.56 = 91,399.64 : x
2. Step 2: Convert to fraction form
   139,769.39/192,832.56 = 91,399.64/x
3. Step 3: Cross multiply
   139,769.39x = 192,832.56 × 91,399.64
4. Step 4: Simplify right side
   139,769.39x = 17,624,825,600.12
5. Step 5: Solve for x
   x = 17,624,825,600.12/139,769.39
6. Step 6: Final answer
   x = 126,099.32