Finding the Fourth Proportional to 42,481.98, 63,718.84 and 12,900.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,481.98 : 63,718.84 = 12,900.07 : x
2. Step 2: Convert to fraction form
   42,481.98/63,718.84 = 12,900.07/x
3. Step 3: Cross multiply
   42,481.98x = 63,718.84 × 12,900.07
4. Step 4: Simplify right side
   42,481.98x = 821,977,496.32
5. Step 5: Solve for x
   x = 821,977,496.32/42,481.98
6. Step 6: Final answer
   x = 19,348.85