Finding the Fourth Proportional to 3,639.72, 5,460.05 and 1,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,639.72 : 5,460.05 = 1,042.72 : x
2. Step 2: Convert to fraction form
   3,639.72/5,460.05 = 1,042.72/x
3. Step 3: Cross multiply
   3,639.72x = 5,460.05 × 1,042.72
4. Step 4: Simplify right side
   3,639.72x = 5,693,303.34
5. Step 5: Solve for x
   x = 5,693,303.34/3,639.72
6. Step 6: Final answer
   x = 1,564.21