Finding the Fourth Proportional to 2,147.72, 2,964.60 and 1,438.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.72 : 2,964.60 = 1,438.16 : x
2. Step 2: Convert to fraction form
   2,147.72/2,964.60 = 1,438.16/x
3. Step 3: Cross multiply
   2,147.72x = 2,964.60 × 1,438.16
4. Step 4: Simplify right side
   2,147.72x = 4,263,554.31
5. Step 5: Solve for x
   x = 4,263,554.31/2,147.72
6. Step 6: Final answer
   x = 1,985.16