Finding the Fourth Proportional to 139,919.39, 193,095.61 and 78,684.85

Step by Step Solution

1. Step 1: Write the proportion equation
   139,919.39 : 193,095.61 = 78,684.85 : x
2. Step 2: Convert to fraction form
   139,919.39/193,095.61 = 78,684.85/x
3. Step 3: Cross multiply
   139,919.39x = 193,095.61 × 78,684.85
4. Step 4: Simplify right side
   139,919.39x = 15,193,699,108.51
5. Step 5: Solve for x
   x = 15,193,699,108.51/139,919.39
6. Step 6: Final answer
   x = 108,588.95