Finding the Fourth Proportional to 1,106.69, 1,672.61 and 1,087.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,106.69 : 1,672.61 = 1,087.56 : x
2. Step 2: Convert to fraction form
   1,106.69/1,672.61 = 1,087.56/x
3. Step 3: Cross multiply
   1,106.69x = 1,672.61 × 1,087.56
4. Step 4: Simplify right side
   1,106.69x = 1,819,058.29
5. Step 5: Solve for x
   x = 1,819,058.29/1,106.69
6. Step 6: Final answer
   x = 1,643.70