Finding the Fourth Proportional to 81,200.30, 121,772.69 and 41,203.85

Step by Step Solution

1. Step 1: Write the proportion equation
   81,200.30 : 121,772.69 = 41,203.85 : x
2. Step 2: Convert to fraction form
   81,200.30/121,772.69 = 41,203.85/x
3. Step 3: Cross multiply
   81,200.30x = 121,772.69 × 41,203.85
4. Step 4: Simplify right side
   81,200.30x = 5,017,503,751.27
5. Step 5: Solve for x
   x = 5,017,503,751.27/81,200.30
6. Step 6: Final answer
   x = 61,791.69