Finding the Fourth Proportional to 117,856, 162,641.60 and 64,864

Step by Step Solution

1. Step 1: Write the proportion equation
   117,856 : 162,641.60 = 64,864 : x
2. Step 2: Convert to fraction form
   117,856/162,641.60 = 64,864/x
3. Step 3: Cross multiply
   117,856x = 162,641.60 × 64,864
4. Step 4: Simplify right side
   117,856x = 10,549,584,742.40
5. Step 5: Solve for x
   x = 10,549,584,742.40/117,856
6. Step 6: Final answer
   x = 89,512.50