Finding the Fourth Proportional to 11,835.72, 17,759.52 and 7,889.64

Step by Step Solution

1. Step 1: Write the proportion equation
   11,835.72 : 17,759.52 = 7,889.64 : x
2. Step 2: Convert to fraction form
   11,835.72/17,759.52 = 7,889.64/x
3. Step 3: Cross multiply
   11,835.72x = 17,759.52 × 7,889.64
4. Step 4: Simplify right side
   11,835.72x = 140,116,219.37
5. Step 5: Solve for x
   x = 140,116,219.37/11,835.72
6. Step 6: Final answer
   x = 11,838.42