Finding the Fourth Proportional to 1,878.72, 2,815.20 and 1,293.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,878.72 : 2,815.20 = 1,293.12 : x
2. Step 2: Convert to fraction form
   1,878.72/2,815.20 = 1,293.12/x
3. Step 3: Cross multiply
   1,878.72x = 2,815.20 × 1,293.12
4. Step 4: Simplify right side
   1,878.72x = 3,640,391.42
5. Step 5: Solve for x
   x = 3,640,391.42/1,878.72
6. Step 6: Final answer
   x = 1,937.70