Finding the Fourth Proportional to 1,905.47, 2,855.62 and 808.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,905.47 : 2,855.62 = 808.46 : x
2. Step 2: Convert to fraction form
   1,905.47/2,855.62 = 808.46/x
3. Step 3: Cross multiply
   1,905.47x = 2,855.62 × 808.46
4. Step 4: Simplify right side
   1,905.47x = 2,308,654.55
5. Step 5: Solve for x
   x = 2,308,654.55/1,905.47
6. Step 6: Final answer
   x = 1,211.59