Finding the Fourth Proportional to 6,457.59, 9,688.74 and 3,989.58

Step by Step Solution

1. Step 1: Write the proportion equation
   6,457.59 : 9,688.74 = 3,989.58 : x
2. Step 2: Convert to fraction form
   6,457.59/9,688.74 = 3,989.58/x
3. Step 3: Cross multiply
   6,457.59x = 9,688.74 × 3,989.58
4. Step 4: Simplify right side
   6,457.59x = 38,654,003.33
5. Step 5: Solve for x
   x = 38,654,003.33/6,457.59
6. Step 6: Final answer
   x = 5,985.82