Finding the Fourth Proportional to 137,285.89, 205,909.24 and 53,085.63

Step by Step Solution

1. Step 1: Write the proportion equation
   137,285.89 : 205,909.24 = 53,085.63 : x
2. Step 2: Convert to fraction form
   137,285.89/205,909.24 = 53,085.63/x
3. Step 3: Cross multiply
   137,285.89x = 205,909.24 × 53,085.63
4. Step 4: Simplify right side
   137,285.89x = 10,930,821,308.96
5. Step 5: Solve for x
   x = 10,930,821,308.96/137,285.89
6. Step 6: Final answer
   x = 79,620.87