Finding the Fourth Proportional to 13,279.42, 19,918.32 and 5,488.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,279.42 : 19,918.32 = 5,488.03 : x
2. Step 2: Convert to fraction form
   13,279.42/19,918.32 = 5,488.03/x
3. Step 3: Cross multiply
   13,279.42x = 19,918.32 × 5,488.03
4. Step 4: Simplify right side
   13,279.42x = 109,312,337.71
5. Step 5: Solve for x
   x = 109,312,337.71/13,279.42
6. Step 6: Final answer
   x = 8,231.71