Finding the Fourth Proportional to 51,455.60, 71,005.56 and 28,790.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,455.60 : 71,005.56 = 28,790.72 : x
2. Step 2: Convert to fraction form
   51,455.60/71,005.56 = 28,790.72/x
3. Step 3: Cross multiply
   51,455.60x = 71,005.56 × 28,790.72
4. Step 4: Simplify right side
   51,455.60x = 2,044,301,196.40
5. Step 5: Solve for x
   x = 2,044,301,196.40/51,455.60
6. Step 6: Final answer
   x = 39,729.42