Finding the Fourth Proportional to 2,572.28, 3,858.82 and 840.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,572.28 : 3,858.82 = 840.50 : x
2. Step 2: Convert to fraction form
   2,572.28/3,858.82 = 840.50/x
3. Step 3: Cross multiply
   2,572.28x = 3,858.82 × 840.50
4. Step 4: Simplify right side
   2,572.28x = 3,243,338.21
5. Step 5: Solve for x
   x = 3,243,338.21/2,572.28
6. Step 6: Final answer
   x = 1,260.88