Finding the Fourth Proportional to 1,947.06, 2,920.78 and 648.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.06 : 2,920.78 = 648.62 : x
2. Step 2: Convert to fraction form
   1,947.06/2,920.78 = 648.62/x
3. Step 3: Cross multiply
   1,947.06x = 2,920.78 × 648.62
4. Step 4: Simplify right side
   1,947.06x = 1,894,476.32
5. Step 5: Solve for x
   x = 1,894,476.32/1,947.06
6. Step 6: Final answer
   x = 972.99