Finding the Fourth Proportional to 2,115.48, 3,173.52 and 654.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.48 : 3,173.52 = 654.42 : x
2. Step 2: Convert to fraction form
   2,115.48/3,173.52 = 654.42/x
3. Step 3: Cross multiply
   2,115.48x = 3,173.52 × 654.42
4. Step 4: Simplify right side
   2,115.48x = 2,076,814.96
5. Step 5: Solve for x
   x = 2,076,814.96/2,115.48
6. Step 6: Final answer
   x = 981.72