Finding the Fourth Proportional to 1,978.72, 2,966.64 and 1,708

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.72 : 2,966.64 = 1,708 : x
2. Step 2: Convert to fraction form
   1,978.72/2,966.64 = 1,708/x
3. Step 3: Cross multiply
   1,978.72x = 2,966.64 × 1,708
4. Step 4: Simplify right side
   1,978.72x = 5,067,021.12
5. Step 5: Solve for x
   x = 5,067,021.12/1,978.72
6. Step 6: Final answer
   x = 2,560.76