Finding the Fourth Proportional to 100,641.94, 138,899.01 and 64,935.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100,641.94 : 138,899.01 = 64,935.82 : x
2. Step 2: Convert to fraction form
   100,641.94/138,899.01 = 64,935.82/x
3. Step 3: Cross multiply
   100,641.94x = 138,899.01 × 64,935.82
4. Step 4: Simplify right side
   100,641.94x = 9,019,521,111.54
5. Step 5: Solve for x
   x = 9,019,521,111.54/100,641.94
6. Step 6: Final answer
   x = 89,619.91