Finding the Fourth Proportional to 118,858.20, 164,025.59 and 65,142.06

Step by Step Solution

1. Step 1: Write the proportion equation
   118,858.20 : 164,025.59 = 65,142.06 : x
2. Step 2: Convert to fraction form
   118,858.20/164,025.59 = 65,142.06/x
3. Step 3: Cross multiply
   118,858.20x = 164,025.59 × 65,142.06
4. Step 4: Simplify right side
   118,858.20x = 10,684,964,825.32
5. Step 5: Solve for x
   x = 10,684,964,825.32/118,858.20
6. Step 6: Final answer
   x = 89,896.74