Finding the Fourth Proportional to 119,128.92, 164,399.76 and 65,418.75

Step by Step Solution

1. Step 1: Write the proportion equation
   119,128.92 : 164,399.76 = 65,418.75 : x
2. Step 2: Convert to fraction form
   119,128.92/164,399.76 = 65,418.75/x
3. Step 3: Cross multiply
   119,128.92x = 164,399.76 × 65,418.75
4. Step 4: Simplify right side
   119,128.92x = 10,754,826,799.50
5. Step 5: Solve for x
   x = 10,754,826,799.50/119,128.92
6. Step 6: Final answer
   x = 90,278.89