Finding the Fourth Proportional to 9,907.50, 13,672.96 and 5,715.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.50 : 13,672.96 = 5,715.75 : x
2. Step 2: Convert to fraction form
   9,907.50/13,672.96 = 5,715.75/x
3. Step 3: Cross multiply
   9,907.50x = 13,672.96 × 5,715.75
4. Step 4: Simplify right side
   9,907.50x = 78,151,221.12
5. Step 5: Solve for x
   x = 78,151,221.12/9,907.50
6. Step 6: Final answer
   x = 7,888.09