Finding the Fourth Proportional to 1,207.41, 1,667.59 and 813.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.41 : 1,667.59 = 813.75 : x
2. Step 2: Convert to fraction form
   1,207.41/1,667.59 = 813.75/x
3. Step 3: Cross multiply
   1,207.41x = 1,667.59 × 813.75
4. Step 4: Simplify right side
   1,207.41x = 1,356,993.02
5. Step 5: Solve for x
   x = 1,356,993.02/1,207.41
6. Step 6: Final answer
   x = 1,123.89