Finding the Fourth Proportional to 42,692.82, 64,070.73 and 20,518.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,692.82 : 64,070.73 = 20,518.98 : x
2. Step 2: Convert to fraction form
   42,692.82/64,070.73 = 20,518.98/x
3. Step 3: Cross multiply
   42,692.82x = 64,070.73 × 20,518.98
4. Step 4: Simplify right side
   42,692.82x = 1,314,666,027.46
5. Step 5: Solve for x
   x = 1,314,666,027.46/42,692.82
6. Step 6: Final answer
   x = 30,793.61