Finding the Fourth Proportional to 12,899.84, 17,804.95 and 7,866.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.84 : 17,804.95 = 7,866.83 : x
2. Step 2: Convert to fraction form
   12,899.84/17,804.95 = 7,866.83/x
3. Step 3: Cross multiply
   12,899.84x = 17,804.95 × 7,866.83
4. Step 4: Simplify right side
   12,899.84x = 140,068,539.65
5. Step 5: Solve for x
   x = 140,068,539.65/12,899.84
6. Step 6: Final answer
   x = 10,858.17