Finding the Fourth Proportional to 118,128, 163,016.64 and 65,136

Step by Step Solution

1. Step 1: Write the proportion equation
   118,128 : 163,016.64 = 65,136 : x
2. Step 2: Convert to fraction form
   118,128/163,016.64 = 65,136/x
3. Step 3: Cross multiply
   118,128x = 163,016.64 × 65,136
4. Step 4: Simplify right side
   118,128x = 10,618,251,863.04
5. Step 5: Solve for x
   x = 10,618,251,863.04/118,128
6. Step 6: Final answer
   x = 89,887.68