Finding the Fourth Proportional to 3,573.69, 5,359.90 and 1,380.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,573.69 : 5,359.90 = 1,380.61 : x
2. Step 2: Convert to fraction form
   3,573.69/5,359.90 = 1,380.61/x
3. Step 3: Cross multiply
   3,573.69x = 5,359.90 × 1,380.61
4. Step 4: Simplify right side
   3,573.69x = 7,399,931.54
5. Step 5: Solve for x
   x = 7,399,931.54/3,573.69
6. Step 6: Final answer
   x = 2,070.67