Finding the Fourth Proportional to 57,705.50, 79,633.61 and 31,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,705.50 : 79,633.61 = 31,209.50 : x
2. Step 2: Convert to fraction form
   57,705.50/79,633.61 = 31,209.50/x
3. Step 3: Cross multiply
   57,705.50x = 79,633.61 × 31,209.50
4. Step 4: Simplify right side
   57,705.50x = 2,485,325,151.30
5. Step 5: Solve for x
   x = 2,485,325,151.30/57,705.50
6. Step 6: Final answer
   x = 43,069.12