Finding the Fourth Proportional to 1,684.70, 2,525.72 and 818.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,684.70 : 2,525.72 = 818.78 : x
2. Step 2: Convert to fraction form
   1,684.70/2,525.72 = 818.78/x
3. Step 3: Cross multiply
   1,684.70x = 2,525.72 × 818.78
4. Step 4: Simplify right side
   1,684.70x = 2,068,009.02
5. Step 5: Solve for x
   x = 2,068,009.02/1,684.70
6. Step 6: Final answer
   x = 1,227.52