Finding the Fourth Proportional to 1,570.81, 2,167.01 and 1,011.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,570.81 : 2,167.01 = 1,011.17 : x
2. Step 2: Convert to fraction form
   1,570.81/2,167.01 = 1,011.17/x
3. Step 3: Cross multiply
   1,570.81x = 2,167.01 × 1,011.17
4. Step 4: Simplify right side
   1,570.81x = 2,191,215.50
5. Step 5: Solve for x
   x = 2,191,215.50/1,570.81
6. Step 6: Final answer
   x = 1,394.96