Finding the Fourth Proportional to 3,828.57, 5,279.54 and 3,605.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,828.57 : 5,279.54 = 3,605.34 : x
2. Step 2: Convert to fraction form
   3,828.57/5,279.54 = 3,605.34/x
3. Step 3: Cross multiply
   3,828.57x = 5,279.54 × 3,605.34
4. Step 4: Simplify right side
   3,828.57x = 19,034,492.32
5. Step 5: Solve for x
   x = 19,034,492.32/3,828.57
6. Step 6: Final answer
   x = 4,971.70