Finding the Fourth Proportional to 2,128.50, 3,192.63 and 1,306.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.50 : 3,192.63 = 1,306.89 : x
2. Step 2: Convert to fraction form
   2,128.50/3,192.63 = 1,306.89/x
3. Step 3: Cross multiply
   2,128.50x = 3,192.63 × 1,306.89
4. Step 4: Simplify right side
   2,128.50x = 4,172,416.22
5. Step 5: Solve for x
   x = 4,172,416.22/2,128.50
6. Step 6: Final answer
   x = 1,960.26