Finding the Fourth Proportional to 105,978.32, 158,999.28 and 42,765.92

Step by Step Solution

1. Step 1: Write the proportion equation
   105,978.32 : 158,999.28 = 42,765.92 : x
2. Step 2: Convert to fraction form
   105,978.32/158,999.28 = 42,765.92/x
3. Step 3: Cross multiply
   105,978.32x = 158,999.28 × 42,765.92
4. Step 4: Simplify right side
   105,978.32x = 6,799,750,488.54
5. Step 5: Solve for x
   x = 6,799,750,488.54/105,978.32
6. Step 6: Final answer
   x = 64,161.71