Finding the Fourth Proportional to 2,131.80, 3,195.64 and 900.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.80 : 3,195.64 = 900.28 : x
2. Step 2: Convert to fraction form
   2,131.80/3,195.64 = 900.28/x
3. Step 3: Cross multiply
   2,131.80x = 3,195.64 × 900.28
4. Step 4: Simplify right side
   2,131.80x = 2,876,970.78
5. Step 5: Solve for x
   x = 2,876,970.78/2,131.80
6. Step 6: Final answer
   x = 1,349.55