Finding the Fourth Proportional to 13,870.28, 19,140.82 and 7,902.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.28 : 19,140.82 = 7,902.31 : x
2. Step 2: Convert to fraction form
   13,870.28/19,140.82 = 7,902.31/x
3. Step 3: Cross multiply
   13,870.28x = 19,140.82 × 7,902.31
4. Step 4: Simplify right side
   13,870.28x = 151,256,693.29
5. Step 5: Solve for x
   x = 151,256,693.29/13,870.28
6. Step 6: Final answer
   x = 10,905.09