Finding the Fourth Proportional to 139,733.86, 208,956.90 and 103,778.17

Step by Step Solution

1. Step 1: Write the proportion equation
   139,733.86 : 208,956.90 = 103,778.17 : x
2. Step 2: Convert to fraction form
   139,733.86/208,956.90 = 103,778.17/x
3. Step 3: Cross multiply
   139,733.86x = 208,956.90 × 103,778.17
4. Step 4: Simplify right side
   139,733.86x = 21,685,164,690.87
5. Step 5: Solve for x
   x = 21,685,164,690.87/139,733.86
6. Step 6: Final answer
   x = 155,189.05