Finding the Fourth Proportional to 139,363.79, 192,317.63 and 78,940.01

Step by Step Solution

1. Step 1: Write the proportion equation
   139,363.79 : 192,317.63 = 78,940.01 : x
2. Step 2: Convert to fraction form
   139,363.79/192,317.63 = 78,940.01/x
3. Step 3: Cross multiply
   139,363.79x = 192,317.63 × 78,940.01
4. Step 4: Simplify right side
   139,363.79x = 15,181,555,721.47
5. Step 5: Solve for x
   x = 15,181,555,721.47/139,363.79
6. Step 6: Final answer
   x = 108,934.73