Finding the Fourth Proportional to 33,985, 50,977.53 and 12,920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   33,985 : 50,977.53 = 12,920.10 : x
2. Step 2: Convert to fraction form
   33,985/50,977.53 = 12,920.10/x
3. Step 3: Cross multiply
   33,985x = 50,977.53 × 12,920.10
4. Step 4: Simplify right side
   33,985x = 658,634,530.47
5. Step 5: Solve for x
   x = 658,634,530.47/33,985
6. Step 6: Final answer
   x = 19,380.15