Finding the Fourth Proportional to 2,157.93, 2,978.30 and 1,214.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.93 : 2,978.30 = 1,214.15 : x
2. Step 2: Convert to fraction form
   2,157.93/2,978.30 = 1,214.15/x
3. Step 3: Cross multiply
   2,157.93x = 2,978.30 × 1,214.15
4. Step 4: Simplify right side
   2,157.93x = 3,616,091.09
5. Step 5: Solve for x
   x = 3,616,091.09/2,157.93
6. Step 6: Final answer
   x = 1,675.72