Finding the Fourth Proportional to 139,113.12, 191,980.46 and 78,682.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,113.12 : 191,980.46 = 78,682.58 : x
2. Step 2: Convert to fraction form
   139,113.12/191,980.46 = 78,682.58/x
3. Step 3: Cross multiply
   139,113.12x = 191,980.46 × 78,682.58
4. Step 4: Simplify right side
   139,113.12x = 15,105,517,988.93
5. Step 5: Solve for x
   x = 15,105,517,988.93/139,113.12
6. Step 6: Final answer
   x = 108,584.42