Finding the Fourth Proportional to 1,573.74, 2,171.88 and 910.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.74 : 2,171.88 = 910.59 : x
2. Step 2: Convert to fraction form
   1,573.74/2,171.88 = 910.59/x
3. Step 3: Cross multiply
   1,573.74x = 2,171.88 × 910.59
4. Step 4: Simplify right side
   1,573.74x = 1,977,692.21
5. Step 5: Solve for x
   x = 1,977,692.21/1,573.74
6. Step 6: Final answer
   x = 1,256.68