Finding the Fourth Proportional to 2,654.51, 3,978.45 and 1,680.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,654.51 : 3,978.45 = 1,680.89 : x
2. Step 2: Convert to fraction form
   2,654.51/3,978.45 = 1,680.89/x
3. Step 3: Cross multiply
   2,654.51x = 3,978.45 × 1,680.89
4. Step 4: Simplify right side
   2,654.51x = 6,687,316.93
5. Step 5: Solve for x
   x = 6,687,316.93/2,654.51
6. Step 6: Final answer
   x = 2,519.23