Finding the Fourth Proportional to 1,288.67, 1,931.37 and 1,074.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.67 : 1,931.37 = 1,074.83 : x
2. Step 2: Convert to fraction form
   1,288.67/1,931.37 = 1,074.83/x
3. Step 3: Cross multiply
   1,288.67x = 1,931.37 × 1,074.83
4. Step 4: Simplify right side
   1,288.67x = 2,075,894.42
5. Step 5: Solve for x
   x = 2,075,894.42/1,288.67
6. Step 6: Final answer
   x = 1,610.88