Finding the Fourth Proportional to 118,406.83, 163,399.52 and 64,690.70

Step by Step Solution

1. Step 1: Write the proportion equation
   118,406.83 : 163,399.52 = 64,690.70 : x
2. Step 2: Convert to fraction form
   118,406.83/163,399.52 = 64,690.70/x
3. Step 3: Cross multiply
   118,406.83x = 163,399.52 × 64,690.70
4. Step 4: Simplify right side
   118,406.83x = 10,570,428,309.31
5. Step 5: Solve for x
   x = 10,570,428,309.31/118,406.83
6. Step 6: Final answer
   x = 89,272.12