Finding the Fourth Proportional to 6,128.09, 8,460.78 and 4,245.45

Step by Step Solution

1. Step 1: Write the proportion equation
   6,128.09 : 8,460.78 = 4,245.45 : x
2. Step 2: Convert to fraction form
   6,128.09/8,460.78 = 4,245.45/x
3. Step 3: Cross multiply
   6,128.09x = 8,460.78 × 4,245.45
4. Step 4: Simplify right side
   6,128.09x = 35,919,818.45
5. Step 5: Solve for x
   x = 35,919,818.45/6,128.09
6. Step 6: Final answer
   x = 5,861.50