Finding the Fourth Proportional to 81,431.30, 122,168.55 and 28,835.30

Step by Step Solution

1. Step 1: Write the proportion equation
   81,431.30 : 122,168.55 = 28,835.30 : x
2. Step 2: Convert to fraction form
   81,431.30/122,168.55 = 28,835.30/x
3. Step 3: Cross multiply
   81,431.30x = 122,168.55 × 28,835.30
4. Step 4: Simplify right side
   81,431.30x = 3,522,766,789.82
5. Step 5: Solve for x
   x = 3,522,766,789.82/81,431.30
6. Step 6: Final answer
   x = 43,260.60