Finding the Fourth Proportional to 139,088.39, 191,945.63 and 78,667.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,088.39 : 191,945.63 = 78,667.96 : x
2. Step 2: Convert to fraction form
   139,088.39/191,945.63 = 78,667.96/x
3. Step 3: Cross multiply
   139,088.39x = 191,945.63 × 78,667.96
4. Step 4: Simplify right side
   139,088.39x = 15,099,970,183.29
5. Step 5: Solve for x
   x = 15,099,970,183.29/139,088.39
6. Step 6: Final answer
   x = 108,563.85