Finding the Fourth Proportional to 11,858.05, 16,366.37 and 7,817.78

Step by Step Solution

1. Step 1: Write the proportion equation
   11,858.05 : 16,366.37 = 7,817.78 : x
2. Step 2: Convert to fraction form
   11,858.05/16,366.37 = 7,817.78/x
3. Step 3: Cross multiply
   11,858.05x = 16,366.37 × 7,817.78
4. Step 4: Simplify right side
   11,858.05x = 127,948,680.06
5. Step 5: Solve for x
   x = 127,948,680.06/11,858.05
6. Step 6: Final answer
   x = 10,790.03