Finding the Fourth Proportional to 1,698.50, 2,548.71 and 786.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,698.50 : 2,548.71 = 786.50 : x
2. Step 2: Convert to fraction form
   1,698.50/2,548.71 = 786.50/x
3. Step 3: Cross multiply
   1,698.50x = 2,548.71 × 786.50
4. Step 4: Simplify right side
   1,698.50x = 2,004,560.42
5. Step 5: Solve for x
   x = 2,004,560.42/1,698.50
6. Step 6: Final answer
   x = 1,180.19