Finding the Fourth Proportional to 6,443.40, 8,892.54 and 4,085.76

Step by Step Solution

1. Step 1: Write the proportion equation
   6,443.40 : 8,892.54 = 4,085.76 : x
2. Step 2: Convert to fraction form
   6,443.40/8,892.54 = 4,085.76/x
3. Step 3: Cross multiply
   6,443.40x = 8,892.54 × 4,085.76
4. Step 4: Simplify right side
   6,443.40x = 36,332,784.23
5. Step 5: Solve for x
   x = 36,332,784.23/6,443.40
6. Step 6: Final answer
   x = 5,638.76