Finding the Fourth Proportional to 1,642.55, 2,253.78 and 1,627.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.55 : 2,253.78 = 1,627.07 : x
2. Step 2: Convert to fraction form
   1,642.55/2,253.78 = 1,627.07/x
3. Step 3: Cross multiply
   1,642.55x = 2,253.78 × 1,627.07
4. Step 4: Simplify right side
   1,642.55x = 3,667,046.56
5. Step 5: Solve for x
   x = 3,667,046.56/1,642.55
6. Step 6: Final answer
   x = 2,232.54