Finding the Fourth Proportional to 10,487.36, 15,714.72 and 3,911.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,487.36 : 15,714.72 = 3,911.78 : x
2. Step 2: Convert to fraction form
   10,487.36/15,714.72 = 3,911.78/x
3. Step 3: Cross multiply
   10,487.36x = 15,714.72 × 3,911.78
4. Step 4: Simplify right side
   10,487.36x = 61,472,527.40
5. Step 5: Solve for x
   x = 61,472,527.40/10,487.36
6. Step 6: Final answer
   x = 5,861.58