Finding the Fourth Proportional to 139,717.33, 192,382.94 and 105,312.05

Step by Step Solution

1. Step 1: Write the proportion equation
   139,717.33 : 192,382.94 = 105,312.05 : x
2. Step 2: Convert to fraction form
   139,717.33/192,382.94 = 105,312.05/x
3. Step 3: Cross multiply
   139,717.33x = 192,382.94 × 105,312.05
4. Step 4: Simplify right side
   139,717.33x = 20,260,241,796.43
5. Step 5: Solve for x
   x = 20,260,241,796.43/139,717.33
6. Step 6: Final answer
   x = 145,008.80