Finding the Fourth Proportional to 139,719.34, 192,385.70 and 105,314.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,719.34 : 192,385.70 = 105,314.06 : x
2. Step 2: Convert to fraction form
   139,719.34/192,385.70 = 105,314.06/x
3. Step 3: Cross multiply
   139,719.34x = 192,385.70 × 105,314.06
4. Step 4: Simplify right side
   139,719.34x = 20,260,919,152.94
5. Step 5: Solve for x
   x = 20,260,919,152.94/139,719.34
6. Step 6: Final answer
   x = 145,011.56