Finding the Fourth Proportional to 12,892.31, 19,300.17 and 7,031.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,892.31 : 19,300.17 = 7,031.15 : x
2. Step 2: Convert to fraction form
   12,892.31/19,300.17 = 7,031.15/x
3. Step 3: Cross multiply
   12,892.31x = 19,300.17 × 7,031.15
4. Step 4: Simplify right side
   12,892.31x = 135,702,390.30
5. Step 5: Solve for x
   x = 135,702,390.30/12,892.31
6. Step 6: Final answer
   x = 10,525.84