Finding the Fourth Proportional to 2,128.77, 3,193.29 and 667.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.77 : 3,193.29 = 667.98 : x
2. Step 2: Convert to fraction form
   2,128.77/3,193.29 = 667.98/x
3. Step 3: Cross multiply
   2,128.77x = 3,193.29 × 667.98
4. Step 4: Simplify right side
   2,128.77x = 2,133,053.85
5. Step 5: Solve for x
   x = 2,133,053.85/2,128.77
6. Step 6: Final answer
   x = 1,002.01