Finding the Fourth Proportional to 1,458.72, 2,012.60 and 899.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,458.72 : 2,012.60 = 899.28 : x
2. Step 2: Convert to fraction form
   1,458.72/2,012.60 = 899.28/x
3. Step 3: Cross multiply
   1,458.72x = 2,012.60 × 899.28
4. Step 4: Simplify right side
   1,458.72x = 1,809,890.93
5. Step 5: Solve for x
   x = 1,809,890.93/1,458.72
6. Step 6: Final answer
   x = 1,240.74