Finding the Fourth Proportional to 1,971.89, 2,958.12 and 722.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.89 : 2,958.12 = 722.55 : x
2. Step 2: Convert to fraction form
   1,971.89/2,958.12 = 722.55/x
3. Step 3: Cross multiply
   1,971.89x = 2,958.12 × 722.55
4. Step 4: Simplify right side
   1,971.89x = 2,137,389.61
5. Step 5: Solve for x
   x = 2,137,389.61/1,971.89
6. Step 6: Final answer
   x = 1,083.93