Finding the Fourth Proportional to 1,874.72, 2,812.56 and 720.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,874.72 : 2,812.56 = 720.56 : x
2. Step 2: Convert to fraction form
   1,874.72/2,812.56 = 720.56/x
3. Step 3: Cross multiply
   1,874.72x = 2,812.56 × 720.56
4. Step 4: Simplify right side
   1,874.72x = 2,026,618.23
5. Step 5: Solve for x
   x = 2,026,618.23/1,874.72
6. Step 6: Final answer
   x = 1,081.02