Finding the Fourth Proportional to 2,110.68, 2,911.82 and 1,638.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,110.68 : 2,911.82 = 1,638.72 : x
2. Step 2: Convert to fraction form
   2,110.68/2,911.82 = 1,638.72/x
3. Step 3: Cross multiply
   2,110.68x = 2,911.82 × 1,638.72
4. Step 4: Simplify right side
   2,110.68x = 4,771,649.48
5. Step 5: Solve for x
   x = 4,771,649.48/2,110.68
6. Step 6: Final answer
   x = 2,260.72