Finding the Fourth Proportional to 1,530.20, 2,111.68 and 900.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.20 : 2,111.68 = 900.75 : x
2. Step 2: Convert to fraction form
   1,530.20/2,111.68 = 900.75/x
3. Step 3: Cross multiply
   1,530.20x = 2,111.68 × 900.75
4. Step 4: Simplify right side
   1,530.20x = 1,902,093.51
5. Step 5: Solve for x
   x = 1,902,093.51/1,530.20
6. Step 6: Final answer
   x = 1,243.04