Finding the Fourth Proportional to 1,575.41, 2,173.86 and 912.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.41 : 2,173.86 = 912.15 : x
2. Step 2: Convert to fraction form
   1,575.41/2,173.86 = 912.15/x
3. Step 3: Cross multiply
   1,575.41x = 2,173.86 × 912.15
4. Step 4: Simplify right side
   1,575.41x = 1,982,886.40
5. Step 5: Solve for x
   x = 1,982,886.40/1,575.41
6. Step 6: Final answer
   x = 1,258.65