Finding the Fourth Proportional to 2,543.72, 3,505.86 and 2,188.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.72 : 3,505.86 = 2,188.76 : x
2. Step 2: Convert to fraction form
   2,543.72/3,505.86 = 2,188.76/x
3. Step 3: Cross multiply
   2,543.72x = 3,505.86 × 2,188.76
4. Step 4: Simplify right side
   2,543.72x = 7,673,468.60
5. Step 5: Solve for x
   x = 7,673,468.60/2,543.72
6. Step 6: Final answer
   x = 3,016.64