Finding the Fourth Proportional to 1,530.72, 2,112.87 and 901.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.72 : 2,112.87 = 901.20 : x
2. Step 2: Convert to fraction form
   1,530.72/2,112.87 = 901.20/x
3. Step 3: Cross multiply
   1,530.72x = 2,112.87 × 901.20
4. Step 4: Simplify right side
   1,530.72x = 1,904,103.37
5. Step 5: Solve for x
   x = 1,904,103.37/1,530.72
6. Step 6: Final answer
   x = 1,243.93