Finding the Fourth Proportional to 103,517.55, 155,279.38 and 28,638.31

Step by Step Solution

1. Step 1: Write the proportion equation
   103,517.55 : 155,279.38 = 28,638.31 : x
2. Step 2: Convert to fraction form
   103,517.55/155,279.38 = 28,638.31/x
3. Step 3: Cross multiply
   103,517.55x = 155,279.38 × 28,638.31
4. Step 4: Simplify right side
   103,517.55x = 4,446,939,021.05
5. Step 5: Solve for x
   x = 4,446,939,021.05/103,517.55
6. Step 6: Final answer
   x = 42,958.31