Finding the Fourth Proportional to 1,538.05, 2,122.59 and 839.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,538.05 : 2,122.59 = 839.47 : x
2. Step 2: Convert to fraction form
   1,538.05/2,122.59 = 839.47/x
3. Step 3: Cross multiply
   1,538.05x = 2,122.59 × 839.47
4. Step 4: Simplify right side
   1,538.05x = 1,781,850.63
5. Step 5: Solve for x
   x = 1,781,850.63/1,538.05
6. Step 6: Final answer
   x = 1,158.51