Finding the Fourth Proportional to 1,725.17, 2,380.72 and 939.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.17 : 2,380.72 = 939.21 : x
2. Step 2: Convert to fraction form
   1,725.17/2,380.72 = 939.21/x
3. Step 3: Cross multiply
   1,725.17x = 2,380.72 × 939.21
4. Step 4: Simplify right side
   1,725.17x = 2,235,997.27
5. Step 5: Solve for x
   x = 2,235,997.27/1,725.17
6. Step 6: Final answer
   x = 1,296.11