Finding the Fourth Proportional to 42,480.47, 63,716.60 and 12,898.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,480.47 : 63,716.60 = 12,898.56 : x
2. Step 2: Convert to fraction form
   42,480.47/63,716.60 = 12,898.56/x
3. Step 3: Cross multiply
   42,480.47x = 63,716.60 × 12,898.56
4. Step 4: Simplify right side
   42,480.47x = 821,852,323.60
5. Step 5: Solve for x
   x = 821,852,323.60/42,480.47
6. Step 6: Final answer
   x = 19,346.59