Finding the Fourth Proportional to 13,870.86, 19,145.19 and 7,906.05

Step by Step Solution

1. Step 1: Write the proportion equation
   13,870.86 : 19,145.19 = 7,906.05 : x
2. Step 2: Convert to fraction form
   13,870.86/19,145.19 = 7,906.05/x
3. Step 3: Cross multiply
   13,870.86x = 19,145.19 × 7,906.05
4. Step 4: Simplify right side
   13,870.86x = 151,362,829.40
5. Step 5: Solve for x
   x = 151,362,829.40/13,870.86
6. Step 6: Final answer
   x = 10,912.29