Finding the Fourth Proportional to 1,573.81, 2,171.61 and 910.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.81 : 2,171.61 = 910.72 : x
2. Step 2: Convert to fraction form
   1,573.81/2,171.61 = 910.72/x
3. Step 3: Cross multiply
   1,573.81x = 2,171.61 × 910.72
4. Step 4: Simplify right side
   1,573.81x = 1,977,724.11
5. Step 5: Solve for x
   x = 1,977,724.11/1,573.81
6. Step 6: Final answer
   x = 1,256.65