Finding the Fourth Proportional to 139,780.07, 192,904.59 and 105,263

Step by Step Solution

1. Step 1: Write the proportion equation
   139,780.07 : 192,904.59 = 105,263 : x
2. Step 2: Convert to fraction form
   139,780.07/192,904.59 = 105,263/x
3. Step 3: Cross multiply
   139,780.07x = 192,904.59 × 105,263
4. Step 4: Simplify right side
   139,780.07x = 20,305,715,857.17
5. Step 5: Solve for x
   x = 20,305,715,857.17/139,780.07
6. Step 6: Final answer
   x = 145,269.04