Finding the Fourth Proportional to 139,314.78, 192,266.37 and 78,896.07

Step by Step Solution

1. Step 1: Write the proportion equation
   139,314.78 : 192,266.37 = 78,896.07 : x
2. Step 2: Convert to fraction form
   139,314.78/192,266.37 = 78,896.07/x
3. Step 3: Cross multiply
   139,314.78x = 192,266.37 × 78,896.07
4. Step 4: Simplify right side
   139,314.78x = 15,169,060,986.17
5. Step 5: Solve for x
   x = 15,169,060,986.17/139,314.78
6. Step 6: Final answer
   x = 108,883.36