Finding the Fourth Proportional to 1,155.98, 1,723.96 and 1,100.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.98 : 1,723.96 = 1,100.90 : x
2. Step 2: Convert to fraction form
   1,155.98/1,723.96 = 1,100.90/x
3. Step 3: Cross multiply
   1,155.98x = 1,723.96 × 1,100.90
4. Step 4: Simplify right side
   1,155.98x = 1,897,907.56
5. Step 5: Solve for x
   x = 1,897,907.56/1,155.98
6. Step 6: Final answer
   x = 1,641.82