Finding the Fourth Proportional to 2,142.92, 3,215.55 and 1,492.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.92 : 3,215.55 = 1,492.40 : x
2. Step 2: Convert to fraction form
   2,142.92/3,215.55 = 1,492.40/x
3. Step 3: Cross multiply
   2,142.92x = 3,215.55 × 1,492.40
4. Step 4: Simplify right side
   2,142.92x = 4,798,886.82
5. Step 5: Solve for x
   x = 4,798,886.82/2,142.92
6. Step 6: Final answer
   x = 2,239.41