Finding the Fourth Proportional to 59,009.76, 81,463.59 and 39,990

Step by Step Solution

1. Step 1: Write the proportion equation
   59,009.76 : 81,463.59 = 39,990 : x
2. Step 2: Convert to fraction form
   59,009.76/81,463.59 = 39,990/x
3. Step 3: Cross multiply
   59,009.76x = 81,463.59 × 39,990
4. Step 4: Simplify right side
   59,009.76x = 3,257,728,964.10
5. Step 5: Solve for x
   x = 3,257,728,964.10/59,009.76
6. Step 6: Final answer
   x = 55,206.61