Finding the Fourth Proportional to 51,538.04, 71,128.20 and 28,880.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,538.04 : 71,128.20 = 28,880.72 : x
2. Step 2: Convert to fraction form
   51,538.04/71,128.20 = 28,880.72/x
3. Step 3: Cross multiply
   51,538.04x = 71,128.20 × 28,880.72
4. Step 4: Simplify right side
   51,538.04x = 2,054,233,628.30
5. Step 5: Solve for x
   x = 2,054,233,628.30/51,538.04
6. Step 6: Final answer
   x = 39,858.59