Finding the Fourth Proportional to 9,907.56, 13,672.32 and 5,715.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.56 : 13,672.32 = 5,715.72 : x
2. Step 2: Convert to fraction form
   9,907.56/13,672.32 = 5,715.72/x
3. Step 3: Cross multiply
   9,907.56x = 13,672.32 × 5,715.72
4. Step 4: Simplify right side
   9,907.56x = 78,147,152.87
5. Step 5: Solve for x
   x = 78,147,152.87/9,907.56
6. Step 6: Final answer
   x = 7,887.63