Finding the Fourth Proportional to 109,385.86, 164,078.67 and 42,779.18

Step by Step Solution

1. Step 1: Write the proportion equation
   109,385.86 : 164,078.67 = 42,779.18 : x
2. Step 2: Convert to fraction form
   109,385.86/164,078.67 = 42,779.18/x
3. Step 3: Cross multiply
   109,385.86x = 164,078.67 × 42,779.18
4. Step 4: Simplify right side
   109,385.86x = 7,019,150,958.09
5. Step 5: Solve for x
   x = 7,019,150,958.09/109,385.86
6. Step 6: Final answer
   x = 64,168.72