Finding the Fourth Proportional to 86,756, 129,404.74 and 78,783.17

Step by Step Solution

1. Step 1: Write the proportion equation
   86,756 : 129,404.74 = 78,783.17 : x
2. Step 2: Convert to fraction form
   86,756/129,404.74 = 78,783.17/x
3. Step 3: Cross multiply
   86,756x = 129,404.74 × 78,783.17
4. Step 4: Simplify right side
   86,756x = 10,194,915,236.31
5. Step 5: Solve for x
   x = 10,194,915,236.31/86,756
6. Step 6: Final answer
   x = 117,512.51