Finding the Fourth Proportional to 118,645.72, 163,729.56 and 64,929.76

Step by Step Solution

1. Step 1: Write the proportion equation
   118,645.72 : 163,729.56 = 64,929.76 : x
2. Step 2: Convert to fraction form
   118,645.72/163,729.56 = 64,929.76/x
3. Step 3: Cross multiply
   118,645.72x = 163,729.56 × 64,929.76
4. Step 4: Simplify right side
   118,645.72x = 10,630,921,035.71
5. Step 5: Solve for x
   x = 10,630,921,035.71/118,645.72
6. Step 6: Final answer
   x = 89,602.23