Finding the Fourth Proportional to 1,086.48, 1,642.14 and 1,086.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.48 : 1,642.14 = 1,086.48 : x
2. Step 2: Convert to fraction form
   1,086.48/1,642.14 = 1,086.48/x
3. Step 3: Cross multiply
   1,086.48x = 1,642.14 × 1,086.48
4. Step 4: Simplify right side
   1,086.48x = 1,784,152.27
5. Step 5: Solve for x
   x = 1,784,152.27/1,086.48
6. Step 6: Final answer
   x = 1,642.14