Finding the Fourth Proportional to 3,543.78, 5,315.61 and 946.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,543.78 : 5,315.61 = 946.74 : x
2. Step 2: Convert to fraction form
   3,543.78/5,315.61 = 946.74/x
3. Step 3: Cross multiply
   3,543.78x = 5,315.61 × 946.74
4. Step 4: Simplify right side
   3,543.78x = 5,032,500.61
5. Step 5: Solve for x
   x = 5,032,500.61/3,543.78
6. Step 6: Final answer
   x = 1,420.09