Finding the Fourth Proportional to 117,128.06, 161,633.73 and 65,445.56

Step by Step Solution

1. Step 1: Write the proportion equation
   117,128.06 : 161,633.73 = 65,445.56 : x
2. Step 2: Convert to fraction form
   117,128.06/161,633.73 = 65,445.56/x
3. Step 3: Cross multiply
   117,128.06x = 161,633.73 × 65,445.56
4. Step 4: Simplify right side
   117,128.06x = 10,578,209,974.74
5. Step 5: Solve for x
   x = 10,578,209,974.74/117,128.06
6. Step 6: Final answer
   x = 90,313.20