Finding the Fourth Proportional to 63,019.60, 86,978.64 and 39,140.80

Step by Step Solution

1. Step 1: Write the proportion equation
   63,019.60 : 86,978.64 = 39,140.80 : x
2. Step 2: Convert to fraction form
   63,019.60/86,978.64 = 39,140.80/x
3. Step 3: Cross multiply
   63,019.60x = 86,978.64 × 39,140.80
4. Step 4: Simplify right side
   63,019.60x = 3,404,413,552.51
5. Step 5: Solve for x
   x = 3,404,413,552.51/63,019.60
6. Step 6: Final answer
   x = 54,021.50