Finding the Fourth Proportional to 139,333.28, 192,291.90 and 78,914.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,333.28 : 192,291.90 = 78,914.58 : x
2. Step 2: Convert to fraction form
   139,333.28/192,291.90 = 78,914.58/x
3. Step 3: Cross multiply
   139,333.28x = 192,291.90 × 78,914.58
4. Step 4: Simplify right side
   139,333.28x = 15,174,634,525.90
5. Step 5: Solve for x
   x = 15,174,634,525.90/139,333.28
6. Step 6: Final answer
   x = 108,908.90