Finding the Fourth Proportional to 109,423.20, 164,019.60 and 42,837.60

Step by Step Solution

1. Step 1: Write the proportion equation
   109,423.20 : 164,019.60 = 42,837.60 : x
2. Step 2: Convert to fraction form
   109,423.20/164,019.60 = 42,837.60/x
3. Step 3: Cross multiply
   109,423.20x = 164,019.60 × 42,837.60
4. Step 4: Simplify right side
   109,423.20x = 7,026,206,016.96
5. Step 5: Solve for x
   x = 7,026,206,016.96/109,423.20
6. Step 6: Final answer
   x = 64,211.30