Finding the Fourth Proportional to 42,691.82, 64,069.23 and 20,517.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,691.82 : 64,069.23 = 20,517.98 : x
2. Step 2: Convert to fraction form
   42,691.82/64,069.23 = 20,517.98/x
3. Step 3: Cross multiply
   42,691.82x = 64,069.23 × 20,517.98
4. Step 4: Simplify right side
   42,691.82x = 1,314,571,179.76
5. Step 5: Solve for x
   x = 1,314,571,179.76/42,691.82
6. Step 6: Final answer
   x = 30,792.11