Finding the Fourth Proportional to 1,111.37, 1,667.16 and 453.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.37 : 1,667.16 = 453.11 : x
2. Step 2: Convert to fraction form
   1,111.37/1,667.16 = 453.11/x
3. Step 3: Cross multiply
   1,111.37x = 1,667.16 × 453.11
4. Step 4: Simplify right side
   1,111.37x = 755,398.53
5. Step 5: Solve for x
   x = 755,398.53/1,111.37
6. Step 6: Final answer
   x = 679.70