Finding the Fourth Proportional to 118,609.47, 163,679.61 and 64,893.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118,609.47 : 163,679.61 = 64,893.72 : x
2. Step 2: Convert to fraction form
   118,609.47/163,679.61 = 64,893.72/x
3. Step 3: Cross multiply
   118,609.47x = 163,679.61 × 64,893.72
4. Step 4: Simplify right side
   118,609.47x = 10,621,778,781.05
5. Step 5: Solve for x
   x = 10,621,778,781.05/118,609.47
6. Step 6: Final answer
   x = 89,552.54