Finding the Fourth Proportional to 1,093.40, 1,638.90 and 545.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.40 : 1,638.90 = 545.06 : x
2. Step 2: Convert to fraction form
   1,093.40/1,638.90 = 545.06/x
3. Step 3: Cross multiply
   1,093.40x = 1,638.90 × 545.06
4. Step 4: Simplify right side
   1,093.40x = 893,298.83
5. Step 5: Solve for x
   x = 893,298.83/1,093.40
6. Step 6: Final answer
   x = 816.99