Finding the Fourth Proportional to 1,573.63, 2,172.02 and 910.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.63 : 2,172.02 = 910.88 : x
2. Step 2: Convert to fraction form
   1,573.63/2,172.02 = 910.88/x
3. Step 3: Cross multiply
   1,573.63x = 2,172.02 × 910.88
4. Step 4: Simplify right side
   1,573.63x = 1,978,442.31
5. Step 5: Solve for x
   x = 1,978,442.31/1,573.63
6. Step 6: Final answer
   x = 1,257.25