Finding the Fourth Proportional to 9,907.56, 13,672.35 and 5,431.59

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.56 : 13,672.35 = 5,431.59 : x
2. Step 2: Convert to fraction form
   9,907.56/13,672.35 = 5,431.59/x
3. Step 3: Cross multiply
   9,907.56x = 13,672.35 × 5,431.59
4. Step 4: Simplify right side
   9,907.56x = 74,262,599.54
5. Step 5: Solve for x
   x = 74,262,599.54/9,907.56
6. Step 6: Final answer
   x = 7,495.55