Finding the Fourth Proportional to 123,303.96, 170,105.46 and 72,290.88

Step by Step Solution

1. Step 1: Write the proportion equation
   123,303.96 : 170,105.46 = 72,290.88 : x
2. Step 2: Convert to fraction form
   123,303.96/170,105.46 = 72,290.88/x
3. Step 3: Cross multiply
   123,303.96x = 170,105.46 × 72,290.88
4. Step 4: Simplify right side
   123,303.96x = 12,297,073,396.20
5. Step 5: Solve for x
   x = 12,297,073,396.20/123,303.96
6. Step 6: Final answer
   x = 99,729.75