Finding the Fourth Proportional to 1,265.90, 1,897.69 and 1,072.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,265.90 : 1,897.69 = 1,072.15 : x
2. Step 2: Convert to fraction form
   1,265.90/1,897.69 = 1,072.15/x
3. Step 3: Cross multiply
   1,265.90x = 1,897.69 × 1,072.15
4. Step 4: Simplify right side
   1,265.90x = 2,034,608.33
5. Step 5: Solve for x
   x = 2,034,608.33/1,265.90
6. Step 6: Final answer
   x = 1,607.24