Finding the Fourth Proportional to 10,488.78, 15,735.87 and 3,915

Step by Step Solution

1. Step 1: Write the proportion equation
   10,488.78 : 15,735.87 = 3,915 : x
2. Step 2: Convert to fraction form
   10,488.78/15,735.87 = 3,915/x
3. Step 3: Cross multiply
   10,488.78x = 15,735.87 × 3,915
4. Step 4: Simplify right side
   10,488.78x = 61,605,931.05
5. Step 5: Solve for x
   x = 61,605,931.05/10,488.78
6. Step 6: Final answer
   x = 5,873.51