Finding the Fourth Proportional to 11,858.79, 16,368.53 and 7,828.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,858.79 : 16,368.53 = 7,828.56 : x
2. Step 2: Convert to fraction form
   11,858.79/16,368.53 = 7,828.56/x
3. Step 3: Cross multiply
   11,858.79x = 16,368.53 × 7,828.56
4. Step 4: Simplify right side
   11,858.79x = 128,142,019.22
5. Step 5: Solve for x
   x = 128,142,019.22/11,858.79
6. Step 6: Final answer
   x = 10,805.66