Finding the Fourth Proportional to 9,907.51, 13,672.23 and 5,431.25

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.51 : 13,672.23 = 5,431.25 : x
2. Step 2: Convert to fraction form
   9,907.51/13,672.23 = 5,431.25/x
3. Step 3: Cross multiply
   9,907.51x = 13,672.23 × 5,431.25
4. Step 4: Simplify right side
   9,907.51x = 74,257,333.37
5. Step 5: Solve for x
   x = 74,257,333.37/9,907.51
6. Step 6: Final answer
   x = 7,495.06