Finding the Fourth Proportional to 12,123.18, 16,734.33 and 7,407.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,123.18 : 16,734.33 = 7,407.90 : x
2. Step 2: Convert to fraction form
   12,123.18/16,734.33 = 7,407.90/x
3. Step 3: Cross multiply
   12,123.18x = 16,734.33 × 7,407.90
4. Step 4: Simplify right side
   12,123.18x = 123,966,243.21
5. Step 5: Solve for x
   x = 123,966,243.21/12,123.18
6. Step 6: Final answer
   x = 10,225.55