Finding the Fourth Proportional to 13,031.35, 19,534.17 and 5,128.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,031.35 : 19,534.17 = 5,128.93 : x
2. Step 2: Convert to fraction form
   13,031.35/19,534.17 = 5,128.93/x
3. Step 3: Cross multiply
   13,031.35x = 19,534.17 × 5,128.93
4. Step 4: Simplify right side
   13,031.35x = 100,189,390.54
5. Step 5: Solve for x
   x = 100,189,390.54/13,031.35
6. Step 6: Final answer
   x = 7,688.34