Finding the Fourth Proportional to 1,572.72, 2,360.80 and 842.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,572.72 : 2,360.80 = 842.16 : x
2. Step 2: Convert to fraction form
   1,572.72/2,360.80 = 842.16/x
3. Step 3: Cross multiply
   1,572.72x = 2,360.80 × 842.16
4. Step 4: Simplify right side
   1,572.72x = 1,988,171.33
5. Step 5: Solve for x
   x = 1,988,171.33/1,572.72
6. Step 6: Final answer
   x = 1,264.16