Finding the Fourth Proportional to 72,784.80, 109,129.95 and 28,416.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72,784.80 : 109,129.95 = 28,416.15 : x
2. Step 2: Convert to fraction form
   72,784.80/109,129.95 = 28,416.15/x
3. Step 3: Cross multiply
   72,784.80x = 109,129.95 × 28,416.15
4. Step 4: Simplify right side
   72,784.80x = 3,101,053,028.69
5. Step 5: Solve for x
   x = 3,101,053,028.69/72,784.80
6. Step 6: Final answer
   x = 42,605.78