Finding the Fourth Proportional to 100,890.38, 139,181.94 and 65,091.89

Step by Step Solution

1. Step 1: Write the proportion equation
   100,890.38 : 139,181.94 = 65,091.89 : x
2. Step 2: Convert to fraction form
   100,890.38/139,181.94 = 65,091.89/x
3. Step 3: Cross multiply
   100,890.38x = 139,181.94 × 65,091.89
4. Step 4: Simplify right side
   100,890.38x = 9,059,614,832.56
5. Step 5: Solve for x
   x = 9,059,614,832.56/100,890.38
6. Step 6: Final answer
   x = 89,796.62