Finding the Fourth Proportional to 9,907.88, 13,672.52 and 5,431.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.88 : 13,672.52 = 5,431.54 : x
2. Step 2: Convert to fraction form
   9,907.88/13,672.52 = 5,431.54/x
3. Step 3: Cross multiply
   9,907.88x = 13,672.52 × 5,431.54
4. Step 4: Simplify right side
   9,907.88x = 74,262,770.22
5. Step 5: Solve for x
   x = 74,262,770.22/9,907.88
6. Step 6: Final answer
   x = 7,495.32