Finding the Fourth Proportional to 1,366.09, 1,885.28 and 1,287.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,366.09 : 1,885.28 = 1,287.12 : x
2. Step 2: Convert to fraction form
   1,366.09/1,885.28 = 1,287.12/x
3. Step 3: Cross multiply
   1,366.09x = 1,885.28 × 1,287.12
4. Step 4: Simplify right side
   1,366.09x = 2,426,581.59
5. Step 5: Solve for x
   x = 2,426,581.59/1,366.09
6. Step 6: Final answer
   x = 1,776.30