Finding the Fourth Proportional to 42,806.40, 64,530.42 and 39,951.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,806.40 : 64,530.42 = 39,951.96 : x
2. Step 2: Convert to fraction form
   42,806.40/64,530.42 = 39,951.96/x
3. Step 3: Cross multiply
   42,806.40x = 64,530.42 × 39,951.96
4. Step 4: Simplify right side
   42,806.40x = 2,578,116,758.62
5. Step 5: Solve for x
   x = 2,578,116,758.62/42,806.40
6. Step 6: Final answer
   x = 60,227.37