Finding the Fourth Proportional to 2,165.57, 2,988.82 and 1,421.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.57 : 2,988.82 = 1,421.69 : x
2. Step 2: Convert to fraction form
   2,165.57/2,988.82 = 1,421.69/x
3. Step 3: Cross multiply
   2,165.57x = 2,988.82 × 1,421.69
4. Step 4: Simplify right side
   2,165.57x = 4,249,162.34
5. Step 5: Solve for x
   x = 4,249,162.34/2,165.57
6. Step 6: Final answer
   x = 1,962.15