Finding the Fourth Proportional to 10,842.12, 16,259.94 and 3,915

Step by Step Solution

1. Step 1: Write the proportion equation
   10,842.12 : 16,259.94 = 3,915 : x
2. Step 2: Convert to fraction form
   10,842.12/16,259.94 = 3,915/x
3. Step 3: Cross multiply
   10,842.12x = 16,259.94 × 3,915
4. Step 4: Simplify right side
   10,842.12x = 63,657,665.10
5. Step 5: Solve for x
   x = 63,657,665.10/10,842.12
6. Step 6: Final answer
   x = 5,871.33