Finding the Fourth Proportional to 2,214.77, 3,315.72 and 1,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,214.77 : 3,315.72 = 1,287.50 : x
2. Step 2: Convert to fraction form
   2,214.77/3,315.72 = 1,287.50/x
3. Step 3: Cross multiply
   2,214.77x = 3,315.72 × 1,287.50
4. Step 4: Simplify right side
   2,214.77x = 4,268,974.77
5. Step 5: Solve for x
   x = 4,268,974.77/2,214.77
6. Step 6: Final answer
   x = 1,927.50