Finding the Fourth Proportional to 1,571.60, 2,167.56 and 1,012.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,571.60 : 2,167.56 = 1,012.12 : x
2. Step 2: Convert to fraction form
   1,571.60/2,167.56 = 1,012.12/x
3. Step 3: Cross multiply
   1,571.60x = 2,167.56 × 1,012.12
4. Step 4: Simplify right side
   1,571.60x = 2,193,825.41
5. Step 5: Solve for x
   x = 2,193,825.41/1,571.60
6. Step 6: Final answer
   x = 1,395.92