Finding the Fourth Proportional to 118,406.86, 163,403.81 and 64,695.21

Step by Step Solution

1. Step 1: Write the proportion equation
   118,406.86 : 163,403.81 = 64,695.21 : x
2. Step 2: Convert to fraction form
   118,406.86/163,403.81 = 64,695.21/x
3. Step 3: Cross multiply
   118,406.86x = 163,403.81 × 64,695.21
4. Step 4: Simplify right side
   118,406.86x = 10,571,443,473.03
5. Step 5: Solve for x
   x = 10,571,443,473.03/118,406.86
6. Step 6: Final answer
   x = 89,280.67