Finding the Fourth Proportional to 139,290, 192,218.31 and 78,859.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,290 : 192,218.31 = 78,859.08 : x
2. Step 2: Convert to fraction form
   139,290/192,218.31 = 78,859.08/x
3. Step 3: Cross multiply
   139,290x = 192,218.31 × 78,859.08
4. Step 4: Simplify right side
   139,290x = 15,158,159,085.75
5. Step 5: Solve for x
   x = 15,158,159,085.75/139,290
6. Step 6: Final answer
   x = 108,824.46