Finding the Fourth Proportional to 1,573.69, 2,171.70 and 910.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.69 : 2,171.70 = 910.54 : x
2. Step 2: Convert to fraction form
   1,573.69/2,171.70 = 910.54/x
3. Step 3: Cross multiply
   1,573.69x = 2,171.70 × 910.54
4. Step 4: Simplify right side
   1,573.69x = 1,977,419.72
5. Step 5: Solve for x
   x = 1,977,419.72/1,573.69
6. Step 6: Final answer
   x = 1,256.55