Finding the Fourth Proportional to 1,938.72, 2,906.43 and 842.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,938.72 : 2,906.43 = 842.25 : x
2. Step 2: Convert to fraction form
   1,938.72/2,906.43 = 842.25/x
3. Step 3: Cross multiply
   1,938.72x = 2,906.43 × 842.25
4. Step 4: Simplify right side
   1,938.72x = 2,447,947.93
5. Step 5: Solve for x
   x = 2,447,947.93/1,938.72
6. Step 6: Final answer
   x = 1,262.66