Finding the Fourth Proportional to 1,378.18, 1,901.79 and 818.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,378.18 : 1,901.79 = 818.62 : x
2. Step 2: Convert to fraction form
   1,378.18/1,901.79 = 818.62/x
3. Step 3: Cross multiply
   1,378.18x = 1,901.79 × 818.62
4. Step 4: Simplify right side
   1,378.18x = 1,556,843.33
5. Step 5: Solve for x
   x = 1,556,843.33/1,378.18
6. Step 6: Final answer
   x = 1,129.64