Finding the Fourth Proportional to 118,436.33, 163,441.80 and 64,721.69

Step by Step Solution

1. Step 1: Write the proportion equation
   118,436.33 : 163,441.80 = 64,721.69 : x
2. Step 2: Convert to fraction form
   118,436.33/163,441.80 = 64,721.69/x
3. Step 3: Cross multiply
   118,436.33x = 163,441.80 × 64,721.69
4. Step 4: Simplify right side
   118,436.33x = 10,578,228,695.43
5. Step 5: Solve for x
   x = 10,578,228,695.43/118,436.33
6. Step 6: Final answer
   x = 89,315.75