Finding the Fourth Proportional to 30,692.18, 42,374.68 and 21,017.83

Step by Step Solution

1. Step 1: Write the proportion equation
   30,692.18 : 42,374.68 = 21,017.83 : x
2. Step 2: Convert to fraction form
   30,692.18/42,374.68 = 21,017.83/x
3. Step 3: Cross multiply
   30,692.18x = 42,374.68 × 21,017.83
4. Step 4: Simplify right side
   30,692.18x = 890,623,741.52
5. Step 5: Solve for x
   x = 890,623,741.52/30,692.18
6. Step 6: Final answer
   x = 29,017.93