Finding the Fourth Proportional to 1,573.42, 2,171.34 and 910.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.42 : 2,171.34 = 910.30 : x
2. Step 2: Convert to fraction form
   1,573.42/2,171.34 = 910.30/x
3. Step 3: Cross multiply
   1,573.42x = 2,171.34 × 910.30
4. Step 4: Simplify right side
   1,573.42x = 1,976,570.80
5. Step 5: Solve for x
   x = 1,976,570.80/1,573.42
6. Step 6: Final answer
   x = 1,256.23