Finding the Fourth Proportional to 118,667.89, 163,760.31 and 64,218.80

Step by Step Solution

1. Step 1: Write the proportion equation
   118,667.89 : 163,760.31 = 64,218.80 : x
2. Step 2: Convert to fraction form
   118,667.89/163,760.31 = 64,218.80/x
3. Step 3: Cross multiply
   118,667.89x = 163,760.31 × 64,218.80
4. Step 4: Simplify right side
   118,667.89x = 10,516,490,595.83
5. Step 5: Solve for x
   x = 10,516,490,595.83/118,667.89
6. Step 6: Final answer
   x = 88,621.20