Finding the Fourth Proportional to 72,768.69, 109,148.58 and 42,799.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,768.69 : 109,148.58 = 42,799.50 : x
2. Step 2: Convert to fraction form
   72,768.69/109,148.58 = 42,799.50/x
3. Step 3: Cross multiply
   72,768.69x = 109,148.58 × 42,799.50
4. Step 4: Simplify right side
   72,768.69x = 4,671,504,649.71
5. Step 5: Solve for x
   x = 4,671,504,649.71/72,768.69
6. Step 6: Final answer
   x = 64,196.63