Finding the Fourth Proportional to 1,571.72, 2,168.26 and 981.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.72 : 2,168.26 = 981.96 : x
2. Step 2: Convert to fraction form
   1,571.72/2,168.26 = 981.96/x
3. Step 3: Cross multiply
   1,571.72x = 2,168.26 × 981.96
4. Step 4: Simplify right side
   1,571.72x = 2,129,144.59
5. Step 5: Solve for x
   x = 2,129,144.59/1,571.72
6. Step 6: Final answer
   x = 1,354.66