Finding the Fourth Proportional to 2,158.72, 3,237.59 and 842.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.72 : 3,237.59 = 842.51 : x
2. Step 2: Convert to fraction form
   2,158.72/3,237.59 = 842.51/x
3. Step 3: Cross multiply
   2,158.72x = 3,237.59 × 842.51
4. Step 4: Simplify right side
   2,158.72x = 2,727,685.76
5. Step 5: Solve for x
   x = 2,727,685.76/2,158.72
6. Step 6: Final answer
   x = 1,263.57