Finding the Fourth Proportional to 1,572.57, 2,359.89 and 842.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,572.57 : 2,359.89 = 842.67 : x
2. Step 2: Convert to fraction form
   1,572.57/2,359.89 = 842.67/x
3. Step 3: Cross multiply
   1,572.57x = 2,359.89 × 842.67
4. Step 4: Simplify right side
   1,572.57x = 1,988,608.51
5. Step 5: Solve for x
   x = 1,988,608.51/1,572.57
6. Step 6: Final answer
   x = 1,264.56