Finding the Fourth Proportional to 1,265.89, 1,889.46 and 1,187.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,265.89 : 1,889.46 = 1,187.98 : x
2. Step 2: Convert to fraction form
   1,265.89/1,889.46 = 1,187.98/x
3. Step 3: Cross multiply
   1,265.89x = 1,889.46 × 1,187.98
4. Step 4: Simplify right side
   1,265.89x = 2,244,640.69
5. Step 5: Solve for x
   x = 2,244,640.69/1,265.89
6. Step 6: Final answer
   x = 1,773.17