Finding the Fourth Proportional to 11,886.98, 16,411.50 and 7,639.94

Step by Step Solution

1. Step 1: Write the proportion equation
   11,886.98 : 16,411.50 = 7,639.94 : x
2. Step 2: Convert to fraction form
   11,886.98/16,411.50 = 7,639.94/x
3. Step 3: Cross multiply
   11,886.98x = 16,411.50 × 7,639.94
4. Step 4: Simplify right side
   11,886.98x = 125,382,875.31
5. Step 5: Solve for x
   x = 125,382,875.31/11,886.98
6. Step 6: Final answer
   x = 10,547.92