Finding the Fourth Proportional to 139,369.28, 192,409.38 and 91,761

Step by Step Solution

1. Step 1: Write the proportion equation
   139,369.28 : 192,409.38 = 91,761 : x
2. Step 2: Convert to fraction form
   139,369.28/192,409.38 = 91,761/x
3. Step 3: Cross multiply
   139,369.28x = 192,409.38 × 91,761
4. Step 4: Simplify right side
   139,369.28x = 17,655,677,118.18
5. Step 5: Solve for x
   x = 17,655,677,118.18/139,369.28
6. Step 6: Final answer
   x = 126,682.71