Finding the Fourth Proportional to 1,581.36, 2,181.78 and 1,248.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.36 : 2,181.78 = 1,248.72 : x
2. Step 2: Convert to fraction form
   1,581.36/2,181.78 = 1,248.72/x
3. Step 3: Cross multiply
   1,581.36x = 2,181.78 × 1,248.72
4. Step 4: Simplify right side
   1,581.36x = 2,724,432.32
5. Step 5: Solve for x
   x = 2,724,432.32/1,581.36
6. Step 6: Final answer
   x = 1,722.84