Finding the Fourth Proportional to 57,659.49, 86,309.25 and 42,479.21

Step by Step Solution

1. Step 1: Write the proportion equation
   57,659.49 : 86,309.25 = 42,479.21 : x
2. Step 2: Convert to fraction form
   57,659.49/86,309.25 = 42,479.21/x
3. Step 3: Cross multiply
   57,659.49x = 86,309.25 × 42,479.21
4. Step 4: Simplify right side
   57,659.49x = 3,666,348,755.69
5. Step 5: Solve for x
   x = 3,666,348,755.69/57,659.49
6. Step 6: Final answer
   x = 63,586.22