Finding the Fourth Proportional to 1,575.25, 2,173.69 and 912.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.25 : 2,173.69 = 912.31 : x
2. Step 2: Convert to fraction form
   1,575.25/2,173.69 = 912.31/x
3. Step 3: Cross multiply
   1,575.25x = 2,173.69 × 912.31
4. Step 4: Simplify right side
   1,575.25x = 1,983,081.93
5. Step 5: Solve for x
   x = 1,983,081.93/1,575.25
6. Step 6: Final answer
   x = 1,258.90