Finding the Fourth Proportional to 13,139.08, 19,714.04 and 7,288.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.08 : 19,714.04 = 7,288.72 : x
2. Step 2: Convert to fraction form
   13,139.08/19,714.04 = 7,288.72/x
3. Step 3: Cross multiply
   13,139.08x = 19,714.04 × 7,288.72
4. Step 4: Simplify right side
   13,139.08x = 143,690,117.63
5. Step 5: Solve for x
   x = 143,690,117.63/13,139.08
6. Step 6: Final answer
   x = 10,936.09