Finding the Fourth Proportional to 2,158.50, 2,978.76 and 1,372.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.50 : 2,978.76 = 1,372.38 : x
2. Step 2: Convert to fraction form
   2,158.50/2,978.76 = 1,372.38/x
3. Step 3: Cross multiply
   2,158.50x = 2,978.76 × 1,372.38
4. Step 4: Simplify right side
   2,158.50x = 4,087,990.65
5. Step 5: Solve for x
   x = 4,087,990.65/2,158.50
6. Step 6: Final answer
   x = 1,893.90