Finding the Fourth Proportional to 139,436.93, 192,407.31 and 78,994.63

Step by Step Solution

1. Step 1: Write the proportion equation
   139,436.93 : 192,407.31 = 78,994.63 : x
2. Step 2: Convert to fraction form
   139,436.93/192,407.31 = 78,994.63/x
3. Step 3: Cross multiply
   139,436.93x = 192,407.31 × 78,994.63
4. Step 4: Simplify right side
   139,436.93x = 15,199,143,532.05
5. Step 5: Solve for x
   x = 15,199,143,532.05/139,436.93
6. Step 6: Final answer
   x = 109,003.72