Finding the Fourth Proportional to 2,118.49, 2,921.87 and 1,372.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.49 : 2,921.87 = 1,372.61 : x
2. Step 2: Convert to fraction form
   2,118.49/2,921.87 = 1,372.61/x
3. Step 3: Cross multiply
   2,118.49x = 2,921.87 × 1,372.61
4. Step 4: Simplify right side
   2,118.49x = 4,010,598.72
5. Step 5: Solve for x
   x = 4,010,598.72/2,118.49
6. Step 6: Final answer
   x = 1,893.14