Finding the Fourth Proportional to 1,538.65, 2,122.61 and 1,118.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.65 : 2,122.61 = 1,118.81 : x
2. Step 2: Convert to fraction form
   1,538.65/2,122.61 = 1,118.81/x
3. Step 3: Cross multiply
   1,538.65x = 2,122.61 × 1,118.81
4. Step 4: Simplify right side
   1,538.65x = 2,374,797.01
5. Step 5: Solve for x
   x = 2,374,797.01/1,538.65
6. Step 6: Final answer
   x = 1,543.43