Finding the Fourth Proportional to 109,419.48, 164,063.56 and 42,780.18

Step by Step Solution

1. Step 1: Write the proportion equation
   109,419.48 : 164,063.56 = 42,780.18 : x
2. Step 2: Convert to fraction form
   109,419.48/164,063.56 = 42,780.18/x
3. Step 3: Cross multiply
   109,419.48x = 164,063.56 × 42,780.18
4. Step 4: Simplify right side
   109,419.48x = 7,018,668,628.24
5. Step 5: Solve for x
   x = 7,018,668,628.24/109,419.48
6. Step 6: Final answer
   x = 64,144.60