Finding the Fourth Proportional to 72,311.53, 99,789.15 and 40,480.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72,311.53 : 99,789.15 = 40,480.69 : x
2. Step 2: Convert to fraction form
   72,311.53/99,789.15 = 40,480.69/x
3. Step 3: Cross multiply
   72,311.53x = 99,789.15 × 40,480.69
4. Step 4: Simplify right side
   72,311.53x = 4,039,533,646.51
5. Step 5: Solve for x
   x = 4,039,533,646.51/72,311.53
6. Step 6: Final answer
   x = 55,862.93