Finding the Fourth Proportional to 42,807.34, 64,152.68 and 20,619.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,807.34 : 64,152.68 = 20,619.10 : x
2. Step 2: Convert to fraction form
   42,807.34/64,152.68 = 20,619.10/x
3. Step 3: Cross multiply
   42,807.34x = 64,152.68 × 20,619.10
4. Step 4: Simplify right side
   42,807.34x = 1,322,770,524.19
5. Step 5: Solve for x
   x = 1,322,770,524.19/42,807.34
6. Step 6: Final answer
   x = 30,900.55