Finding the Fourth Proportional to 3,543.72, 5,279.97 and 3,345

Step by Step Solution

1. Step 1: Write the proportion equation
   3,543.72 : 5,279.97 = 3,345 : x
2. Step 2: Convert to fraction form
   3,543.72/5,279.97 = 3,345/x
3. Step 3: Cross multiply
   3,543.72x = 5,279.97 × 3,345
4. Step 4: Simplify right side
   3,543.72x = 17,661,499.65
5. Step 5: Solve for x
   x = 17,661,499.65/3,543.72
6. Step 6: Final answer
   x = 4,983.89