Finding the Fourth Proportional to 1,964.32, 2,709.25 and 1,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,964.32 : 2,709.25 = 1,218.72 : x
2. Step 2: Convert to fraction form
   1,964.32/2,709.25 = 1,218.72/x
3. Step 3: Cross multiply
   1,964.32x = 2,709.25 × 1,218.72
4. Step 4: Simplify right side
   1,964.32x = 3,301,817.16
5. Step 5: Solve for x
   x = 3,301,817.16/1,964.32
6. Step 6: Final answer
   x = 1,680.90