Finding the Fourth Proportional to 1,209.24, 1,667.52 and 987.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,209.24 : 1,667.52 = 987.48 : x
2. Step 2: Convert to fraction form
   1,209.24/1,667.52 = 987.48/x
3. Step 3: Cross multiply
   1,209.24x = 1,667.52 × 987.48
4. Step 4: Simplify right side
   1,209.24x = 1,646,642.65
5. Step 5: Solve for x
   x = 1,646,642.65/1,209.24
6. Step 6: Final answer
   x = 1,361.72