Finding the Fourth Proportional to 83,764.16, 115,500.72 and 78,449.75

Step by Step Solution

1. Step 1: Write the proportion equation
   83,764.16 : 115,500.72 = 78,449.75 : x
2. Step 2: Convert to fraction form
   83,764.16/115,500.72 = 78,449.75/x
3. Step 3: Cross multiply
   83,764.16x = 115,500.72 × 78,449.75
4. Step 4: Simplify right side
   83,764.16x = 9,061,002,317.35
5. Step 5: Solve for x
   x = 9,061,002,317.35/83,764.16
6. Step 6: Final answer
   x = 108,172.78