Finding the Fourth Proportional to 14,187, 19,578.06 and 7,899.78

Step by Step Solution

1. Step 1: Write the proportion equation
   14,187 : 19,578.06 = 7,899.78 : x
2. Step 2: Convert to fraction form
   14,187/19,578.06 = 7,899.78/x
3. Step 3: Cross multiply
   14,187x = 19,578.06 × 7,899.78
4. Step 4: Simplify right side
   14,187x = 154,662,366.83
5. Step 5: Solve for x
   x = 154,662,366.83/14,187
6. Step 6: Final answer
   x = 10,901.70