Finding the Fourth Proportional to 1,978.79, 2,962.92 and 1,729.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.79 : 2,962.92 = 1,729.72 : x
2. Step 2: Convert to fraction form
   1,978.79/2,962.92 = 1,729.72/x
3. Step 3: Cross multiply
   1,978.79x = 2,962.92 × 1,729.72
4. Step 4: Simplify right side
   1,978.79x = 5,125,021.98
5. Step 5: Solve for x
   x = 5,125,021.98/1,978.79
6. Step 6: Final answer
   x = 2,589.98