Finding the Fourth Proportional to 72,851.31, 109,290.78 and 28,475.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,851.31 : 109,290.78 = 28,475.28 : x
2. Step 2: Convert to fraction form
   72,851.31/109,290.78 = 28,475.28/x
3. Step 3: Cross multiply
   72,851.31x = 109,290.78 × 28,475.28
4. Step 4: Simplify right side
   72,851.31x = 3,112,085,561.92
5. Step 5: Solve for x
   x = 3,112,085,561.92/72,851.31
6. Step 6: Final answer
   x = 42,718.32