Finding the Fourth Proportional to 118,573.05, 163,628.50 and 64,857.90

Step by Step Solution

1. Step 1: Write the proportion equation
   118,573.05 : 163,628.50 = 64,857.90 : x
2. Step 2: Convert to fraction form
   118,573.05/163,628.50 = 64,857.90/x
3. Step 3: Cross multiply
   118,573.05x = 163,628.50 × 64,857.90
4. Step 4: Simplify right side
   118,573.05x = 10,612,600,890.15
5. Step 5: Solve for x
   x = 10,612,600,890.15/118,573.05
6. Step 6: Final answer
   x = 89,502.64