Finding the Fourth Proportional to 1,808.40, 2,709.50 and 987.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,808.40 : 2,709.50 = 987.25 : x
2. Step 2: Convert to fraction form
   1,808.40/2,709.50 = 987.25/x
3. Step 3: Cross multiply
   1,808.40x = 2,709.50 × 987.25
4. Step 4: Simplify right side
   1,808.40x = 2,674,935.39
5. Step 5: Solve for x
   x = 2,674,935.39/1,808.40
6. Step 6: Final answer
   x = 1,479.18