Finding the Fourth Proportional to 2,131.06, 3,196.56 and 1,264.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.06 : 3,196.56 = 1,264.78 : x
2. Step 2: Convert to fraction form
   2,131.06/3,196.56 = 1,264.78/x
3. Step 3: Cross multiply
   2,131.06x = 3,196.56 × 1,264.78
4. Step 4: Simplify right side
   2,131.06x = 4,042,945.16
5. Step 5: Solve for x
   x = 4,042,945.16/2,131.06
6. Step 6: Final answer
   x = 1,897.15