Finding the Fourth Proportional to 89,538.56, 123,556.20 and 51,815.60

Step by Step Solution

1. Step 1: Write the proportion equation
   89,538.56 : 123,556.20 = 51,815.60 : x
2. Step 2: Convert to fraction form
   89,538.56/123,556.20 = 51,815.60/x
3. Step 3: Cross multiply
   89,538.56x = 123,556.20 × 51,815.60
4. Step 4: Simplify right side
   89,538.56x = 6,402,138,636.72
5. Step 5: Solve for x
   x = 6,402,138,636.72/89,538.56
6. Step 6: Final answer
   x = 71,501.47