Finding the Fourth Proportional to 1,971.78, 2,720.91 and 1,087.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.78 : 2,720.91 = 1,087.58 : x
2. Step 2: Convert to fraction form
   1,971.78/2,720.91 = 1,087.58/x
3. Step 3: Cross multiply
   1,971.78x = 2,720.91 × 1,087.58
4. Step 4: Simplify right side
   1,971.78x = 2,959,196.76
5. Step 5: Solve for x
   x = 2,959,196.76/1,971.78
6. Step 6: Final answer
   x = 1,500.78