Finding the Fourth Proportional to 119,439.60, 164,826.32 and 65,728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   119,439.60 : 164,826.32 = 65,728.10 : x
2. Step 2: Convert to fraction form
   119,439.60/164,826.32 = 65,728.10/x
3. Step 3: Cross multiply
   119,439.60x = 164,826.32 × 65,728.10
4. Step 4: Simplify right side
   119,439.60x = 10,833,720,843.59
5. Step 5: Solve for x
   x = 10,833,720,843.59/119,439.60
6. Step 6: Final answer
   x = 90,704.60