Finding the Fourth Proportional to 1,945.71, 2,920.38 and 906.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,945.71 : 2,920.38 = 906.43 : x
2. Step 2: Convert to fraction form
   1,945.71/2,920.38 = 906.43/x
3. Step 3: Cross multiply
   1,945.71x = 2,920.38 × 906.43
4. Step 4: Simplify right side
   1,945.71x = 2,647,114.25
5. Step 5: Solve for x
   x = 2,647,114.25/1,945.71
6. Step 6: Final answer
   x = 1,360.49