Finding the Fourth Proportional to 72,235.55, 99,685.22 and 39,972.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,235.55 : 99,685.22 = 39,972.50 : x
2. Step 2: Convert to fraction form
   72,235.55/99,685.22 = 39,972.50/x
3. Step 3: Cross multiply
   72,235.55x = 99,685.22 × 39,972.50
4. Step 4: Simplify right side
   72,235.55x = 3,984,667,692.71
5. Step 5: Solve for x
   x = 3,984,667,692.71/72,235.55
6. Step 6: Final answer
   x = 55,162.14