Finding the Fourth Proportional to 1,212.86, 1,818.06 and 692.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212.86 : 1,818.06 = 692.69 : x
2. Step 2: Convert to fraction form
   1,212.86/1,818.06 = 692.69/x
3. Step 3: Cross multiply
   1,212.86x = 1,818.06 × 692.69
4. Step 4: Simplify right side
   1,212.86x = 1,259,342.89
5. Step 5: Solve for x
   x = 1,259,342.89/1,212.86
6. Step 6: Final answer
   x = 1,038.33