Finding the Fourth Proportional to 1,575.15, 2,173.43 and 912.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.15 : 2,173.43 = 912.06 : x
2. Step 2: Convert to fraction form
   1,575.15/2,173.43 = 912.06/x
3. Step 3: Cross multiply
   1,575.15x = 2,173.43 × 912.06
4. Step 4: Simplify right side
   1,575.15x = 1,982,300.85
5. Step 5: Solve for x
   x = 1,982,300.85/1,575.15
6. Step 6: Final answer
   x = 1,258.49