Finding the Fourth Proportional to 118,105.31, 162,986.28 and 64,390.71

Step by Step Solution

1. Step 1: Write the proportion equation
   118,105.31 : 162,986.28 = 64,390.71 : x
2. Step 2: Convert to fraction form
   118,105.31/162,986.28 = 64,390.71/x
3. Step 3: Cross multiply
   118,105.31x = 162,986.28 × 64,390.71
4. Step 4: Simplify right side
   118,105.31x = 10,494,802,289.46
5. Step 5: Solve for x
   x = 10,494,802,289.46/118,105.31
6. Step 6: Final answer
   x = 88,859.70