Finding the Fourth Proportional to 72,990.32, 100,726.72 and 39,456.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,990.32 : 100,726.72 = 39,456.32 : x
2. Step 2: Convert to fraction form
   72,990.32/100,726.72 = 39,456.32/x
3. Step 3: Cross multiply
   72,990.32x = 100,726.72 × 39,456.32
4. Step 4: Simplify right side
   72,990.32x = 3,974,305,696.87
5. Step 5: Solve for x
   x = 3,974,305,696.87/72,990.32
6. Step 6: Final answer
   x = 54,449.76