Finding the Fourth Proportional to 42,986.44, 64,499.50 and 19,620.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,986.44 : 64,499.50 = 19,620.04 : x
2. Step 2: Convert to fraction form
   42,986.44/64,499.50 = 19,620.04/x
3. Step 3: Cross multiply
   42,986.44x = 64,499.50 × 19,620.04
4. Step 4: Simplify right side
   42,986.44x = 1,265,482,769.98
5. Step 5: Solve for x
   x = 1,265,482,769.98/42,986.44
6. Step 6: Final answer
   x = 29,439.12