Finding the Fourth Proportional to 117,139.30, 161,649.26 and 65,456.84

Step by Step Solution

1. Step 1: Write the proportion equation
   117,139.30 : 161,649.26 = 65,456.84 : x
2. Step 2: Convert to fraction form
   117,139.30/161,649.26 = 65,456.84/x
3. Step 3: Cross multiply
   117,139.30x = 161,649.26 × 65,456.84
4. Step 4: Simplify right side
   117,139.30x = 10,581,049,747.94
5. Step 5: Solve for x
   x = 10,581,049,747.94/117,139.30
6. Step 6: Final answer
   x = 90,328.78