Finding the Fourth Proportional to 1,725.69, 2,381.54 and 939.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.69 : 2,381.54 = 939.72 : x
2. Step 2: Convert to fraction form
   1,725.69/2,381.54 = 939.72/x
3. Step 3: Cross multiply
   1,725.69x = 2,381.54 × 939.72
4. Step 4: Simplify right side
   1,725.69x = 2,237,980.77
5. Step 5: Solve for x
   x = 2,237,980.77/1,725.69
6. Step 6: Final answer
   x = 1,296.86