Finding the Fourth Proportional to 64,888.15, 89,539.42 and 39,408.46

Step by Step Solution

1. Step 1: Write the proportion equation
   64,888.15 : 89,539.42 = 39,408.46 : x
2. Step 2: Convert to fraction form
   64,888.15/89,539.42 = 39,408.46/x
3. Step 3: Cross multiply
   64,888.15x = 89,539.42 × 39,408.46
4. Step 4: Simplify right side
   64,888.15x = 3,528,610,105.27
5. Step 5: Solve for x
   x = 3,528,610,105.27/64,888.15
6. Step 6: Final answer
   x = 54,379.89