Finding the Fourth Proportional to 1,209.07, 1,669.34 and 928.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.07 : 1,669.34 = 928.81 : x
2. Step 2: Convert to fraction form
   1,209.07/1,669.34 = 928.81/x
3. Step 3: Cross multiply
   1,209.07x = 1,669.34 × 928.81
4. Step 4: Simplify right side
   1,209.07x = 1,550,499.69
5. Step 5: Solve for x
   x = 1,550,499.69/1,209.07
6. Step 6: Final answer
   x = 1,282.39