Finding the Fourth Proportional to 17,920.96, 26,872.72 and 5,438.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,920.96 : 26,872.72 = 5,438.72 : x
2. Step 2: Convert to fraction form
   17,920.96/26,872.72 = 5,438.72/x
3. Step 3: Cross multiply
   17,920.96x = 26,872.72 × 5,438.72
4. Step 4: Simplify right side
   17,920.96x = 146,153,199.72
5. Step 5: Solve for x
   x = 146,153,199.72/17,920.96
6. Step 6: Final answer
   x = 8,155.43