Finding the Fourth Proportional to 1,571.35, 2,167.56 and 980.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.35 : 2,167.56 = 980.86 : x
2. Step 2: Convert to fraction form
   1,571.35/2,167.56 = 980.86/x
3. Step 3: Cross multiply
   1,571.35x = 2,167.56 × 980.86
4. Step 4: Simplify right side
   1,571.35x = 2,126,071.55
5. Step 5: Solve for x
   x = 2,126,071.55/1,571.35
6. Step 6: Final answer
   x = 1,353.02