Finding the Fourth Proportional to 13,064.59, 19,603.72 and 7,145.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,064.59 : 19,603.72 = 7,145.72 : x
2. Step 2: Convert to fraction form
   13,064.59/19,603.72 = 7,145.72/x
3. Step 3: Cross multiply
   13,064.59x = 19,603.72 × 7,145.72
4. Step 4: Simplify right side
   13,064.59x = 140,082,678.51
5. Step 5: Solve for x
   x = 140,082,678.51/13,064.59
6. Step 6: Final answer
   x = 10,722.32