Finding the Fourth Proportional to 10,945.34, 16,421.88 and 5,402.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,945.34 : 16,421.88 = 5,402.57 : x
2. Step 2: Convert to fraction form
   10,945.34/16,421.88 = 5,402.57/x
3. Step 3: Cross multiply
   10,945.34x = 16,421.88 × 5,402.57
4. Step 4: Simplify right side
   10,945.34x = 88,720,348.47
5. Step 5: Solve for x
   x = 88,720,348.47/10,945.34
6. Step 6: Final answer
   x = 8,105.77