Finding the Fourth Proportional to 1,573.67, 2,171.45 and 901.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.67 : 2,171.45 = 901.40 : x
2. Step 2: Convert to fraction form
   1,573.67/2,171.45 = 901.40/x
3. Step 3: Cross multiply
   1,573.67x = 2,171.45 × 901.40
4. Step 4: Simplify right side
   1,573.67x = 1,957,333.89
5. Step 5: Solve for x
   x = 1,957,333.89/1,573.67
6. Step 6: Final answer
   x = 1,243.80