Finding the Fourth Proportional to 116,649.12, 160,978.80 and 65,663.68

Step by Step Solution

1. Step 1: Write the proportion equation
   116,649.12 : 160,978.80 = 65,663.68 : x
2. Step 2: Convert to fraction form
   116,649.12/160,978.80 = 65,663.68/x
3. Step 3: Cross multiply
   116,649.12x = 160,978.80 × 65,663.68
4. Step 4: Simplify right side
   116,649.12x = 10,570,460,409.98
5. Step 5: Solve for x
   x = 10,570,460,409.98/116,649.12
6. Step 6: Final answer
   x = 90,617.58