Finding the Fourth Proportional to 72,187.12, 108,069.52 and 42,109.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,187.12 : 108,069.52 = 42,109.40 : x
2. Step 2: Convert to fraction form
   72,187.12/108,069.52 = 42,109.40/x
3. Step 3: Cross multiply
   72,187.12x = 108,069.52 × 42,109.40
4. Step 4: Simplify right side
   72,187.12x = 4,550,742,645.49
5. Step 5: Solve for x
   x = 4,550,742,645.49/72,187.12
6. Step 6: Final answer
   x = 63,040.92