Finding the Fourth Proportional to 1,570.47, 2,167.92 and 980.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.47 : 2,167.92 = 980.88 : x
2. Step 2: Convert to fraction form
   1,570.47/2,167.92 = 980.88/x
3. Step 3: Cross multiply
   1,570.47x = 2,167.92 × 980.88
4. Step 4: Simplify right side
   1,570.47x = 2,126,469.37
5. Step 5: Solve for x
   x = 2,126,469.37/1,570.47
6. Step 6: Final answer
   x = 1,354.03