Finding the Fourth Proportional to 100,196.89, 138,365.37 and 64,448.96

Step by Step Solution

1. Step 1: Write the proportion equation
   100,196.89 : 138,365.37 = 64,448.96 : x
2. Step 2: Convert to fraction form
   100,196.89/138,365.37 = 64,448.96/x
3. Step 3: Cross multiply
   100,196.89x = 138,365.37 × 64,448.96
4. Step 4: Simplify right side
   100,196.89x = 8,917,504,196.52
5. Step 5: Solve for x
   x = 8,917,504,196.52/100,196.89
6. Step 6: Final answer
   x = 88,999.81