Finding the Fourth Proportional to 1,538.18, 2,122.72 and 839.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.18 : 2,122.72 = 839.56 : x
2. Step 2: Convert to fraction form
   1,538.18/2,122.72 = 839.56/x
3. Step 3: Cross multiply
   1,538.18x = 2,122.72 × 839.56
4. Step 4: Simplify right side
   1,538.18x = 1,782,150.80
5. Step 5: Solve for x
   x = 1,782,150.80/1,538.18
6. Step 6: Final answer
   x = 1,158.61