Finding the Fourth Proportional to 1,971.72, 2,721.15 and 1,087.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.72 : 2,721.15 = 1,087.74 : x
2. Step 2: Convert to fraction form
   1,971.72/2,721.15 = 1,087.74/x
3. Step 3: Cross multiply
   1,971.72x = 2,721.15 × 1,087.74
4. Step 4: Simplify right side
   1,971.72x = 2,959,903.70
5. Step 5: Solve for x
   x = 2,959,903.70/1,971.72
6. Step 6: Final answer
   x = 1,501.18