Finding the Fourth Proportional to 9,907.48, 13,672.03 and 5,431.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.48 : 13,672.03 = 5,431.15 : x
2. Step 2: Convert to fraction form
   9,907.48/13,672.03 = 5,431.15/x
3. Step 3: Cross multiply
   9,907.48x = 13,672.03 × 5,431.15
4. Step 4: Simplify right side
   9,907.48x = 74,254,750.22
5. Step 5: Solve for x
   x = 74,254,750.22/9,907.48
6. Step 6: Final answer
   x = 7,494.82