Finding the Fourth Proportional to 118,637.33, 163,719 and 64,189.31

Step by Step Solution

1. Step 1: Write the proportion equation
   118,637.33 : 163,719 = 64,189.31 : x
2. Step 2: Convert to fraction form
   118,637.33/163,719 = 64,189.31/x
3. Step 3: Cross multiply
   118,637.33x = 163,719 × 64,189.31
4. Step 4: Simplify right side
   118,637.33x = 10,509,008,825.30
5. Step 5: Solve for x
   x = 10,509,008,825.30/118,637.33
6. Step 6: Final answer
   x = 88,580.97