Finding the Fourth Proportional to 13,870.32, 19,138.82 and 7,902.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.32 : 19,138.82 = 7,902.10 : x
2. Step 2: Convert to fraction form
   13,870.32/19,138.82 = 7,902.10/x
3. Step 3: Cross multiply
   13,870.32x = 19,138.82 × 7,902.10
4. Step 4: Simplify right side
   13,870.32x = 151,236,869.52
5. Step 5: Solve for x
   x = 151,236,869.52/13,870.32
6. Step 6: Final answer
   x = 10,903.63