Finding the Fourth Proportional to 9,886.12, 13,643.78 and 5,907.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,886.12 : 13,643.78 = 5,907.15 : x
2. Step 2: Convert to fraction form
   9,886.12/13,643.78 = 5,907.15/x
3. Step 3: Cross multiply
   9,886.12x = 13,643.78 × 5,907.15
4. Step 4: Simplify right side
   9,886.12x = 80,595,757.27
5. Step 5: Solve for x
   x = 80,595,757.27/9,886.12
6. Step 6: Final answer
   x = 8,152.42