Finding the Fourth Proportional to 2,157.21, 2,978.46 and 1,716.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.21 : 2,978.46 = 1,716.15 : x
2. Step 2: Convert to fraction form
   2,157.21/2,978.46 = 1,716.15/x
3. Step 3: Cross multiply
   2,157.21x = 2,978.46 × 1,716.15
4. Step 4: Simplify right side
   2,157.21x = 5,111,484.13
5. Step 5: Solve for x
   x = 5,111,484.13/2,157.21
6. Step 6: Final answer
   x = 2,369.49