Finding the Fourth Proportional to 105,918.32, 158,842.20 and 42,722.12

Step by Step Solution

1. Step 1: Write the proportion equation
   105,918.32 : 158,842.20 = 42,722.12 : x
2. Step 2: Convert to fraction form
   105,918.32/158,842.20 = 42,722.12/x
3. Step 3: Cross multiply
   105,918.32x = 158,842.20 × 42,722.12
4. Step 4: Simplify right side
   105,918.32x = 6,786,075,529.46
5. Step 5: Solve for x
   x = 6,786,075,529.46/105,918.32
6. Step 6: Final answer
   x = 64,068.95