Finding the Fourth Proportional to 139,113.50, 191,980.97 and 78,682.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,113.50 : 191,980.97 = 78,682.96 : x
2. Step 2: Convert to fraction form
   139,113.50/191,980.97 = 78,682.96/x
3. Step 3: Cross multiply
   139,113.50x = 191,980.97 × 78,682.96
4. Step 4: Simplify right side
   139,113.50x = 15,105,630,404.97
5. Step 5: Solve for x
   x = 15,105,630,404.97/139,113.50
6. Step 6: Final answer
   x = 108,584.94