Finding the Fourth Proportional to 9,978.48, 14,938.68 and 5,805.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.48 : 14,938.68 = 5,805.75 : x
2. Step 2: Convert to fraction form
   9,978.48/14,938.68 = 5,805.75/x
3. Step 3: Cross multiply
   9,978.48x = 14,938.68 × 5,805.75
4. Step 4: Simplify right side
   9,978.48x = 86,730,241.41
5. Step 5: Solve for x
   x = 86,730,241.41/9,978.48
6. Step 6: Final answer
   x = 8,691.73