Finding the Fourth Proportional to 1,592.09, 2,386.79 and 667.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,592.09 : 2,386.79 = 667.21 : x
2. Step 2: Convert to fraction form
   1,592.09/2,386.79 = 667.21/x
3. Step 3: Cross multiply
   1,592.09x = 2,386.79 × 667.21
4. Step 4: Simplify right side
   1,592.09x = 1,592,474.89
5. Step 5: Solve for x
   x = 1,592,474.89/1,592.09
6. Step 6: Final answer
   x = 1,000.24