Finding the Fourth Proportional to 2,086.32, 3,130.74 and 1,264.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.32 : 3,130.74 = 1,264.80 : x
2. Step 2: Convert to fraction form
   2,086.32/3,130.74 = 1,264.80/x
3. Step 3: Cross multiply
   2,086.32x = 3,130.74 × 1,264.80
4. Step 4: Simplify right side
   2,086.32x = 3,959,759.95
5. Step 5: Solve for x
   x = 3,959,759.95/2,086.32
6. Step 6: Final answer
   x = 1,897.96