Finding the Fourth Proportional to 1,947.98, 2,920.67 and 907.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.98 : 2,920.67 = 907.40 : x
2. Step 2: Convert to fraction form
   1,947.98/2,920.67 = 907.40/x
3. Step 3: Cross multiply
   1,947.98x = 2,920.67 × 907.40
4. Step 4: Simplify right side
   1,947.98x = 2,650,196.82
5. Step 5: Solve for x
   x = 2,650,196.82/1,947.98
6. Step 6: Final answer
   x = 1,360.49