Finding the Fourth Proportional to 1,299.84, 1,945.89 and 1,126.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,299.84 : 1,945.89 = 1,126.71 : x
2. Step 2: Convert to fraction form
   1,299.84/1,945.89 = 1,126.71/x
3. Step 3: Cross multiply
   1,299.84x = 1,945.89 × 1,126.71
4. Step 4: Simplify right side
   1,299.84x = 2,192,453.72
5. Step 5: Solve for x
   x = 2,192,453.72/1,299.84
6. Step 6: Final answer
   x = 1,686.71