Finding the Fourth Proportional to 139,145.16, 192,020.36 and 78,714.53

Step by Step Solution

1. Step 1: Write the proportion equation
   139,145.16 : 192,020.36 = 78,714.53 : x
2. Step 2: Convert to fraction form
   139,145.16/192,020.36 = 78,714.53/x
3. Step 3: Cross multiply
   139,145.16x = 192,020.36 × 78,714.53
4. Step 4: Simplify right side
   139,145.16x = 15,114,791,624.52
5. Step 5: Solve for x
   x = 15,114,791,624.52/139,145.16
6. Step 6: Final answer
   x = 108,626.07