Finding the Fourth Proportional to 72,790.47, 109,120.73 and 28,406.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72,790.47 : 109,120.73 = 28,406.88 : x
2. Step 2: Convert to fraction form
   72,790.47/109,120.73 = 28,406.88/x
3. Step 3: Cross multiply
   72,790.47x = 109,120.73 × 28,406.88
4. Step 4: Simplify right side
   72,790.47x = 3,099,779,340.59
5. Step 5: Solve for x
   x = 3,099,779,340.59/72,790.47
6. Step 6: Final answer
   x = 42,584.96