Finding the Fourth Proportional to 2,123.70, 3,187.35 and 1,713.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.70 : 3,187.35 = 1,713.30 : x
2. Step 2: Convert to fraction form
   2,123.70/3,187.35 = 1,713.30/x
3. Step 3: Cross multiply
   2,123.70x = 3,187.35 × 1,713.30
4. Step 4: Simplify right side
   2,123.70x = 5,460,886.76
5. Step 5: Solve for x
   x = 5,460,886.76/2,123.70
6. Step 6: Final answer
   x = 2,571.40