Finding the Fourth Proportional to 1,575.86, 2,173.84 and 985.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.86 : 2,173.84 = 985.37 : x
2. Step 2: Convert to fraction form
   1,575.86/2,173.84 = 985.37/x
3. Step 3: Cross multiply
   1,575.86x = 2,173.84 × 985.37
4. Step 4: Simplify right side
   1,575.86x = 2,142,023.39
5. Step 5: Solve for x
   x = 2,142,023.39/1,575.86
6. Step 6: Final answer
   x = 1,359.28