Finding the Fourth Proportional to 1,806.72, 2,708.48 and 780.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,806.72 : 2,708.48 = 780.16 : x
2. Step 2: Convert to fraction form
   1,806.72/2,708.48 = 780.16/x
3. Step 3: Cross multiply
   1,806.72x = 2,708.48 × 780.16
4. Step 4: Simplify right side
   1,806.72x = 2,113,047.76
5. Step 5: Solve for x
   x = 2,113,047.76/1,806.72
6. Step 6: Final answer
   x = 1,169.55