Finding the Fourth Proportional to 78,433.24, 117,618.72 and 28,486.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78,433.24 : 117,618.72 = 28,486.09 : x
2. Step 2: Convert to fraction form
   78,433.24/117,618.72 = 28,486.09/x
3. Step 3: Cross multiply
   78,433.24x = 117,618.72 × 28,486.09
4. Step 4: Simplify right side
   78,433.24x = 3,350,497,443.60
5. Step 5: Solve for x
   x = 3,350,497,443.60/78,433.24
6. Step 6: Final answer
   x = 42,717.83