Finding the Fourth Proportional to 11,903.76, 16,433.69 and 7,870.77

Step by Step Solution

1. Step 1: Write the proportion equation
   11,903.76 : 16,433.69 = 7,870.77 : x
2. Step 2: Convert to fraction form
   11,903.76/16,433.69 = 7,870.77/x
3. Step 3: Cross multiply
   11,903.76x = 16,433.69 × 7,870.77
4. Step 4: Simplify right side
   11,903.76x = 129,345,754.89
5. Step 5: Solve for x
   x = 129,345,754.89/11,903.76
6. Step 6: Final answer
   x = 10,865.96