Finding the Fourth Proportional to 2,165.50, 2,988.42 and 1,379.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.50 : 2,988.42 = 1,379.38 : x
2. Step 2: Convert to fraction form
   2,165.50/2,988.42 = 1,379.38/x
3. Step 3: Cross multiply
   2,165.50x = 2,988.42 × 1,379.38
4. Step 4: Simplify right side
   2,165.50x = 4,122,166.78
5. Step 5: Solve for x
   x = 4,122,166.78/2,165.50
6. Step 6: Final answer
   x = 1,903.56