Finding the Fourth Proportional to 11,870.16, 16,372.32 and 7,889.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,870.16 : 16,372.32 = 7,889.28 : x
2. Step 2: Convert to fraction form
   11,870.16/16,372.32 = 7,889.28/x
3. Step 3: Cross multiply
   11,870.16x = 16,372.32 × 7,889.28
4. Step 4: Simplify right side
   11,870.16x = 129,165,816.73
5. Step 5: Solve for x
   x = 129,165,816.73/11,870.16
6. Step 6: Final answer
   x = 10,881.56