Finding the Fourth Proportional to 5,123.39, 7,685.51 and 1,425.65

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.39 : 7,685.51 = 1,425.65 : x
2. Step 2: Convert to fraction form
   5,123.39/7,685.51 = 1,425.65/x
3. Step 3: Cross multiply
   5,123.39x = 7,685.51 × 1,425.65
4. Step 4: Simplify right side
   5,123.39x = 10,956,801.78
5. Step 5: Solve for x
   x = 10,956,801.78/5,123.39
6. Step 6: Final answer
   x = 2,138.59