Finding the Fourth Proportional to 1,397.40, 1,929.79 and 1,266.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.40 : 1,929.79 = 1,266.18 : x
2. Step 2: Convert to fraction form
   1,397.40/1,929.79 = 1,266.18/x
3. Step 3: Cross multiply
   1,397.40x = 1,929.79 × 1,266.18
4. Step 4: Simplify right side
   1,397.40x = 2,443,458.34
5. Step 5: Solve for x
   x = 2,443,458.34/1,397.40
6. Step 6: Final answer
   x = 1,748.57