Finding the Fourth Proportional to 9,878.72, 13,632.89 and 5,902.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,878.72 : 13,632.89 = 5,902.13 : x
2. Step 2: Convert to fraction form
   9,878.72/13,632.89 = 5,902.13/x
3. Step 3: Cross multiply
   9,878.72x = 13,632.89 × 5,902.13
4. Step 4: Simplify right side
   9,878.72x = 80,463,059.55
5. Step 5: Solve for x
   x = 80,463,059.55/9,878.72
6. Step 6: Final answer
   x = 8,145.09