Finding the Fourth Proportional to 2,109.78, 3,159.99 and 1,697.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109.78 : 3,159.99 = 1,697.88 : x
2. Step 2: Convert to fraction form
   2,109.78/3,159.99 = 1,697.88/x
3. Step 3: Cross multiply
   2,109.78x = 3,159.99 × 1,697.88
4. Step 4: Simplify right side
   2,109.78x = 5,365,283.82
5. Step 5: Solve for x
   x = 5,365,283.82/2,109.78
6. Step 6: Final answer
   x = 2,543.05