Finding the Fourth Proportional to 1,397.40, 2,092.91 and 667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.40 : 2,092.91 = 667.50 : x
2. Step 2: Convert to fraction form
   1,397.40/2,092.91 = 667.50/x
3. Step 3: Cross multiply
   1,397.40x = 2,092.91 × 667.50
4. Step 4: Simplify right side
   1,397.40x = 1,397,008.63
5. Step 5: Solve for x
   x = 1,397,008.63/1,397.40
6. Step 6: Final answer
   x = 999.72