Finding the Fourth Proportional to 16,811.78, 25,210.37 and 5,715.49

Step by Step Solution

1. Step 1: Write the proportion equation
   16,811.78 : 25,210.37 = 5,715.49 : x
2. Step 2: Convert to fraction form
   16,811.78/25,210.37 = 5,715.49/x
3. Step 3: Cross multiply
   16,811.78x = 25,210.37 × 5,715.49
4. Step 4: Simplify right side
   16,811.78x = 144,089,568.89
5. Step 5: Solve for x
   x = 144,089,568.89/16,811.78
6. Step 6: Final answer
   x = 8,570.75