Finding the Fourth Proportional to 1,950.79, 2,692.15 and 1,287.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,950.79 : 2,692.15 = 1,287.15 : x
2. Step 2: Convert to fraction form
   1,950.79/2,692.15 = 1,287.15/x
3. Step 3: Cross multiply
   1,950.79x = 2,692.15 × 1,287.15
4. Step 4: Simplify right side
   1,950.79x = 3,465,200.87
5. Step 5: Solve for x
   x = 3,465,200.87/1,950.79
6. Step 6: Final answer
   x = 1,776.31