Finding the Fourth Proportional to 1,725.78, 2,376.72 and 1,720.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,725.78 : 2,376.72 = 1,720.38 : x
2. Step 2: Convert to fraction form
   1,725.78/2,376.72 = 1,720.38/x
3. Step 3: Cross multiply
   1,725.78x = 2,376.72 × 1,720.38
4. Step 4: Simplify right side
   1,725.78x = 4,088,861.55
5. Step 5: Solve for x
   x = 4,088,861.55/1,725.78
6. Step 6: Final answer
   x = 2,369.28