Finding the Fourth Proportional to 139,069.14, 191,919.20 and 78,648.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139,069.14 : 191,919.20 = 78,648.82 : x
2. Step 2: Convert to fraction form
   139,069.14/191,919.20 = 78,648.82/x
3. Step 3: Cross multiply
   139,069.14x = 191,919.20 × 78,648.82
4. Step 4: Simplify right side
   139,069.14x = 15,094,217,742.30
5. Step 5: Solve for x
   x = 15,094,217,742.30/139,069.14
6. Step 6: Final answer
   x = 108,537.51