Finding the Fourth Proportional to 139,869.88, 192,969.52 and 79,405.53

Step by Step Solution

1. Step 1: Write the proportion equation
   139,869.88 : 192,969.52 = 79,405.53 : x
2. Step 2: Convert to fraction form
   139,869.88/192,969.52 = 79,405.53/x
3. Step 3: Cross multiply
   139,869.88x = 192,969.52 × 79,405.53
4. Step 4: Simplify right side
   139,869.88x = 15,322,846,386.58
5. Step 5: Solve for x
   x = 15,322,846,386.58/139,869.88
6. Step 6: Final answer
   x = 109,550.72