Finding the Fourth Proportional to 3,639.76, 5,459.56 and 1,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,639.76 : 5,459.56 = 1,042.72 : x
2. Step 2: Convert to fraction form
   3,639.76/5,459.56 = 1,042.72/x
3. Step 3: Cross multiply
   3,639.76x = 5,459.56 × 1,042.72
4. Step 4: Simplify right side
   3,639.76x = 5,692,792.40
5. Step 5: Solve for x
   x = 5,692,792.40/3,639.76
6. Step 6: Final answer
   x = 1,564.06