Finding the Fourth Proportional to 1,129.69, 1,685.98 and 1,100.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,129.69 : 1,685.98 = 1,100.53 : x
2. Step 2: Convert to fraction form
   1,129.69/1,685.98 = 1,100.53/x
3. Step 3: Cross multiply
   1,129.69x = 1,685.98 × 1,100.53
4. Step 4: Simplify right side
   1,129.69x = 1,855,471.57
5. Step 5: Solve for x
   x = 1,855,471.57/1,129.69
6. Step 6: Final answer
   x = 1,642.46