Finding the Fourth Proportional to 1,329.05, 1,991.86 and 548.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,329.05 : 1,991.86 = 548.17 : x
2. Step 2: Convert to fraction form
   1,329.05/1,991.86 = 548.17/x
3. Step 3: Cross multiply
   1,329.05x = 1,991.86 × 548.17
4. Step 4: Simplify right side
   1,329.05x = 1,091,877.90
5. Step 5: Solve for x
   x = 1,091,877.90/1,329.05
6. Step 6: Final answer
   x = 821.55