Finding the Fourth Proportional to 116,419.51, 160,656.78 and 64,739.80

Step by Step Solution

1. Step 1: Write the proportion equation
   116,419.51 : 160,656.78 = 64,739.80 : x
2. Step 2: Convert to fraction form
   116,419.51/160,656.78 = 64,739.80/x
3. Step 3: Cross multiply
   116,419.51x = 160,656.78 × 64,739.80
4. Step 4: Simplify right side
   116,419.51x = 10,400,887,805.84
5. Step 5: Solve for x
   x = 10,400,887,805.84/116,419.51
6. Step 6: Final answer
   x = 89,339.73