Finding the Fourth Proportional to 1,518.89, 2,279.05 and 903.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,518.89 : 2,279.05 = 903.80 : x
2. Step 2: Convert to fraction form
   1,518.89/2,279.05 = 903.80/x
3. Step 3: Cross multiply
   1,518.89x = 2,279.05 × 903.80
4. Step 4: Simplify right side
   1,518.89x = 2,059,808.83
5. Step 5: Solve for x
   x = 2,059,808.83/1,518.89
6. Step 6: Final answer
   x = 1,356.13