Finding the Fourth Proportional to 1,570.80, 2,167.71 and 981.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.80 : 2,167.71 = 981.67 : x
2. Step 2: Convert to fraction form
   1,570.80/2,167.71 = 981.67/x
3. Step 3: Cross multiply
   1,570.80x = 2,167.71 × 981.67
4. Step 4: Simplify right side
   1,570.80x = 2,127,975.88
5. Step 5: Solve for x
   x = 2,127,975.88/1,570.80
6. Step 6: Final answer
   x = 1,354.71