Finding the Fourth Proportional to 1,298.25, 1,947.42 and 721.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.25 : 1,947.42 = 721.17 : x
2. Step 2: Convert to fraction form
   1,298.25/1,947.42 = 721.17/x
3. Step 3: Cross multiply
   1,298.25x = 1,947.42 × 721.17
4. Step 4: Simplify right side
   1,298.25x = 1,404,420.88
5. Step 5: Solve for x
   x = 1,404,420.88/1,298.25
6. Step 6: Final answer
   x = 1,081.78