Finding the Fourth Proportional to 1,123.06, 1,684.71 and 545.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.06 : 1,684.71 = 545.50 : x
2. Step 2: Convert to fraction form
   1,123.06/1,684.71 = 545.50/x
3. Step 3: Cross multiply
   1,123.06x = 1,684.71 × 545.50
4. Step 4: Simplify right side
   1,123.06x = 919,009.31
5. Step 5: Solve for x
   x = 919,009.31/1,123.06
6. Step 6: Final answer
   x = 818.31