Finding the Fourth Proportional to 42,930.02, 64,401.93 and 20,745.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,930.02 : 64,401.93 = 20,745.03 : x
2. Step 2: Convert to fraction form
   42,930.02/64,401.93 = 20,745.03/x
3. Step 3: Cross multiply
   42,930.02x = 64,401.93 × 20,745.03
4. Step 4: Simplify right side
   42,930.02x = 1,336,019,969.91
5. Step 5: Solve for x
   x = 1,336,019,969.91/42,930.02
6. Step 6: Final answer
   x = 31,120.88