Finding the Fourth Proportional to 1,698.51, 2,548.71 and 918.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,698.51 : 2,548.71 = 918.50 : x
2. Step 2: Convert to fraction form
   1,698.51/2,548.71 = 918.50/x
3. Step 3: Cross multiply
   1,698.51x = 2,548.71 × 918.50
4. Step 4: Simplify right side
   1,698.51x = 2,340,977.39
5. Step 5: Solve for x
   x = 2,340,977.39/1,698.51
6. Step 6: Final answer
   x = 1,378.25