Finding the Fourth Proportional to 1,211.71, 1,815.89 and 749.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.71 : 1,815.89 = 749.71 : x
2. Step 2: Convert to fraction form
   1,211.71/1,815.89 = 749.71/x
3. Step 3: Cross multiply
   1,211.71x = 1,815.89 × 749.71
4. Step 4: Simplify right side
   1,211.71x = 1,361,385.52
5. Step 5: Solve for x
   x = 1,361,385.52/1,211.71
6. Step 6: Final answer
   x = 1,123.52