Finding the Fourth Proportional to 100,563.55, 138,778.61 and 55,242.45

Step by Step Solution

1. Step 1: Write the proportion equation
   100,563.55 : 138,778.61 = 55,242.45 : x
2. Step 2: Convert to fraction form
   100,563.55/138,778.61 = 55,242.45/x
3. Step 3: Cross multiply
   100,563.55x = 138,778.61 × 55,242.45
4. Step 4: Simplify right side
   100,563.55x = 7,666,470,147.78
5. Step 5: Solve for x
   x = 7,666,470,147.78/100,563.55
6. Step 6: Final answer
   x = 76,235.08