Finding the Fourth Proportional to 1,817.94, 2,507.04 and 1,221.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,817.94 : 2,507.04 = 1,221.78 : x
2. Step 2: Convert to fraction form
   1,817.94/2,507.04 = 1,221.78/x
3. Step 3: Cross multiply
   1,817.94x = 2,507.04 × 1,221.78
4. Step 4: Simplify right side
   1,817.94x = 3,063,051.33
5. Step 5: Solve for x
   x = 3,063,051.33/1,817.94
6. Step 6: Final answer
   x = 1,684.90