Finding the Fourth Proportional to 42,482.76, 63,720.01 and 12,900.85

Step by Step Solution

1. Step 1: Write the proportion equation
   42,482.76 : 63,720.01 = 12,900.85 : x
2. Step 2: Convert to fraction form
   42,482.76/63,720.01 = 12,900.85/x
3. Step 3: Cross multiply
   42,482.76x = 63,720.01 × 12,900.85
4. Step 4: Simplify right side
   42,482.76x = 822,042,147.83
5. Step 5: Solve for x
   x = 822,042,147.83/42,482.76
6. Step 6: Final answer
   x = 19,350.02