Finding the Fourth Proportional to 109,278.72, 163,969.92 and 64,992.78

Step by Step Solution

1. Step 1: Write the proportion equation
   109,278.72 : 163,969.92 = 64,992.78 : x
2. Step 2: Convert to fraction form
   109,278.72/163,969.92 = 64,992.78/x
3. Step 3: Cross multiply
   109,278.72x = 163,969.92 × 64,992.78
4. Step 4: Simplify right side
   109,278.72x = 10,656,860,937.18
5. Step 5: Solve for x
   x = 10,656,860,937.18/109,278.72
6. Step 6: Final answer
   x = 97,520.00