Finding the Fourth Proportional to 61,185.50, 84,483.78 and 39,685.47

Step by Step Solution

1. Step 1: Write the proportion equation
   61,185.50 : 84,483.78 = 39,685.47 : x
2. Step 2: Convert to fraction form
   61,185.50/84,483.78 = 39,685.47/x
3. Step 3: Cross multiply
   61,185.50x = 84,483.78 × 39,685.47
4. Step 4: Simplify right side
   61,185.50x = 3,352,777,895.83
5. Step 5: Solve for x
   x = 3,352,777,895.83/61,185.50
6. Step 6: Final answer
   x = 54,796.94