Finding the Fourth Proportional to 64,568.90, 89,112.31 and 39,089.31

Step by Step Solution

1. Step 1: Write the proportion equation
   64,568.90 : 89,112.31 = 39,089.31 : x
2. Step 2: Convert to fraction form
   64,568.90/89,112.31 = 39,089.31/x
3. Step 3: Cross multiply
   64,568.90x = 89,112.31 × 39,089.31
4. Step 4: Simplify right side
   64,568.90x = 3,483,338,710.41
5. Step 5: Solve for x
   x = 3,483,338,710.41/64,568.90
6. Step 6: Final answer
   x = 53,947.62