Finding the Fourth Proportional to 139,378.81, 192,328.89 and 78,937.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,378.81 : 192,328.89 = 78,937.42 : x
2. Step 2: Convert to fraction form
   139,378.81/192,328.89 = 78,937.42/x
3. Step 3: Cross multiply
   139,378.81x = 192,328.89 × 78,937.42
4. Step 4: Simplify right side
   139,378.81x = 15,181,946,368.06
5. Step 5: Solve for x
   x = 15,181,946,368.06/139,378.81
6. Step 6: Final answer
   x = 108,925.79