Finding the Fourth Proportional to 1,106.58, 1,672.41 and 1,087.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.58 : 1,672.41 = 1,087.45 : x
2. Step 2: Convert to fraction form
   1,106.58/1,672.41 = 1,087.45/x
3. Step 3: Cross multiply
   1,106.58x = 1,672.41 × 1,087.45
4. Step 4: Simplify right side
   1,106.58x = 1,818,662.25
5. Step 5: Solve for x
   x = 1,818,662.25/1,106.58
6. Step 6: Final answer
   x = 1,643.50