Finding the Fourth Proportional to 1,211.86, 1,667.28 and 1,069.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.86 : 1,667.28 = 1,069.38 : x
2. Step 2: Convert to fraction form
   1,211.86/1,667.28 = 1,069.38/x
3. Step 3: Cross multiply
   1,211.86x = 1,667.28 × 1,069.38
4. Step 4: Simplify right side
   1,211.86x = 1,782,955.89
5. Step 5: Solve for x
   x = 1,782,955.89/1,211.86
6. Step 6: Final answer
   x = 1,471.26