Finding the Fourth Proportional to 1,575.57, 2,172.27 and 985.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.57 : 2,172.27 = 985.89 : x
2. Step 2: Convert to fraction form
   1,575.57/2,172.27 = 985.89/x
3. Step 3: Cross multiply
   1,575.57x = 2,172.27 × 985.89
4. Step 4: Simplify right side
   1,575.57x = 2,141,619.27
5. Step 5: Solve for x
   x = 2,141,619.27/1,575.57
6. Step 6: Final answer
   x = 1,359.27