Finding the Fourth Proportional to 1,971.88, 2,721.42 and 1,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.88 : 2,721.42 = 1,308.50 : x
2. Step 2: Convert to fraction form
   1,971.88/2,721.42 = 1,308.50/x
3. Step 3: Cross multiply
   1,971.88x = 2,721.42 × 1,308.50
4. Step 4: Simplify right side
   1,971.88x = 3,560,978.07
5. Step 5: Solve for x
   x = 3,560,978.07/1,971.88
6. Step 6: Final answer
   x = 1,805.88