Finding the Fourth Proportional to 1,530.28, 2,111.74 and 900.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.28 : 2,111.74 = 900.68 : x
2. Step 2: Convert to fraction form
   1,530.28/2,111.74 = 900.68/x
3. Step 3: Cross multiply
   1,530.28x = 2,111.74 × 900.68
4. Step 4: Simplify right side
   1,530.28x = 1,902,001.98
5. Step 5: Solve for x
   x = 1,902,001.98/1,530.28
6. Step 6: Final answer
   x = 1,242.91