Finding the Fourth Proportional to 1,575.07, 2,171.59 and 985.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.07 : 2,171.59 = 985.39 : x
2. Step 2: Convert to fraction form
   1,575.07/2,171.59 = 985.39/x
3. Step 3: Cross multiply
   1,575.07x = 2,171.59 × 985.39
4. Step 4: Simplify right side
   1,575.07x = 2,139,863.07
5. Step 5: Solve for x
   x = 2,139,863.07/1,575.07
6. Step 6: Final answer
   x = 1,358.58