Finding the Fourth Proportional to 2,574.01, 3,861.42 and 842.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,574.01 : 3,861.42 = 842.50 : x
2. Step 2: Convert to fraction form
   2,574.01/3,861.42 = 842.50/x
3. Step 3: Cross multiply
   2,574.01x = 3,861.42 × 842.50
4. Step 4: Simplify right side
   2,574.01x = 3,253,246.35
5. Step 5: Solve for x
   x = 3,253,246.35/2,574.01
6. Step 6: Final answer
   x = 1,263.88