Finding the Fourth Proportional to 1,575.42, 2,172.15 and 1,108.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,575.42 : 2,172.15 = 1,108.86 : x
2. Step 2: Convert to fraction form
   1,575.42/2,172.15 = 1,108.86/x
3. Step 3: Cross multiply
   1,575.42x = 2,172.15 × 1,108.86
4. Step 4: Simplify right side
   1,575.42x = 2,408,610.25
5. Step 5: Solve for x
   x = 2,408,610.25/1,575.42
6. Step 6: Final answer
   x = 1,528.87