Finding the Fourth Proportional to 12,907.20, 17,818.56 and 8,437.44

Step by Step Solution

1. Step 1: Write the proportion equation
   12,907.20 : 17,818.56 = 8,437.44 : x
2. Step 2: Convert to fraction form
   12,907.20/17,818.56 = 8,437.44/x
3. Step 3: Cross multiply
   12,907.20x = 17,818.56 × 8,437.44
4. Step 4: Simplify right side
   12,907.20x = 150,343,030.89
5. Step 5: Solve for x
   x = 150,343,030.89/12,907.20
6. Step 6: Final answer
   x = 11,648.00