Finding the Fourth Proportional to 72,939.84, 109,458.98 and 28,561.06

Step by Step Solution

1. Step 1: Write the proportion equation
   72,939.84 : 109,458.98 = 28,561.06 : x
2. Step 2: Convert to fraction form
   72,939.84/109,458.98 = 28,561.06/x
3. Step 3: Cross multiply
   72,939.84x = 109,458.98 × 28,561.06
4. Step 4: Simplify right side
   72,939.84x = 3,126,263,980.73
5. Step 5: Solve for x
   x = 3,126,263,980.73/72,939.84
6. Step 6: Final answer
   x = 42,860.85