Finding the Fourth Proportional to 139,718.01, 192,383.89 and 105,312.75

Step by Step Solution

1. Step 1: Write the proportion equation
   139,718.01 : 192,383.89 = 105,312.75 : x
2. Step 2: Convert to fraction form
   139,718.01/192,383.89 = 105,312.75/x
3. Step 3: Cross multiply
   139,718.01x = 192,383.89 × 105,312.75
4. Step 4: Simplify right side
   139,718.01x = 20,260,475,526.88
5. Step 5: Solve for x
   x = 20,260,475,526.88/139,718.01
6. Step 6: Final answer
   x = 145,009.76