Finding the Fourth Proportional to 9,913.56, 13,679.42 and 7,902.06

Step by Step Solution

1. Step 1: Write the proportion equation
   9,913.56 : 13,679.42 = 7,902.06 : x
2. Step 2: Convert to fraction form
   9,913.56/13,679.42 = 7,902.06/x
3. Step 3: Cross multiply
   9,913.56x = 13,679.42 × 7,902.06
4. Step 4: Simplify right side
   9,913.56x = 108,095,597.61
5. Step 5: Solve for x
   x = 108,095,597.61/9,913.56
6. Step 6: Final answer
   x = 10,903.81