Finding the Fourth Proportional to 1,573.89, 2,171.73 and 910.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.89 : 2,171.73 = 910.61 : x
2. Step 2: Convert to fraction form
   1,573.89/2,171.73 = 910.61/x
3. Step 3: Cross multiply
   1,573.89x = 2,171.73 × 910.61
4. Step 4: Simplify right side
   1,573.89x = 1,977,604.48
5. Step 5: Solve for x
   x = 1,977,604.48/1,573.89
6. Step 6: Final answer
   x = 1,256.51