Finding the Fourth Proportional to 139,322.69, 192,265.28 and 78,893.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,322.69 : 192,265.28 = 78,893.31 : x
2. Step 2: Convert to fraction form
   139,322.69/192,265.28 = 78,893.31/x
3. Step 3: Cross multiply
   139,322.69x = 192,265.28 × 78,893.31
4. Step 4: Simplify right side
   139,322.69x = 15,168,443,942.81
5. Step 5: Solve for x
   x = 15,168,443,942.81/139,322.69
6. Step 6: Final answer
   x = 108,872.75