Finding the Fourth Proportional to 13,871.31, 19,142.37 and 7,902.99

Step by Step Solution

1. Step 1: Write the proportion equation
   13,871.31 : 19,142.37 = 7,902.99 : x
2. Step 2: Convert to fraction form
   13,871.31/19,142.37 = 7,902.99/x
3. Step 3: Cross multiply
   13,871.31x = 19,142.37 × 7,902.99
4. Step 4: Simplify right side
   13,871.31x = 151,281,958.69
5. Step 5: Solve for x
   x = 151,281,958.69/13,871.31
6. Step 6: Final answer
   x = 10,906.10