Finding the Fourth Proportional to 1,375.21, 1,897.77 and 808.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.21 : 1,897.77 = 808.18 : x
2. Step 2: Convert to fraction form
   1,375.21/1,897.77 = 808.18/x
3. Step 3: Cross multiply
   1,375.21x = 1,897.77 × 808.18
4. Step 4: Simplify right side
   1,375.21x = 1,533,739.76
5. Step 5: Solve for x
   x = 1,533,739.76/1,375.21
6. Step 6: Final answer
   x = 1,115.28