Finding the Fourth Proportional to 42,890.89, 64,265.20 and 30,348.75

Step by Step Solution

1. Step 1: Write the proportion equation
   42,890.89 : 64,265.20 = 30,348.75 : x
2. Step 2: Convert to fraction form
   42,890.89/64,265.20 = 30,348.75/x
3. Step 3: Cross multiply
   42,890.89x = 64,265.20 × 30,348.75
4. Step 4: Simplify right side
   42,890.89x = 1,950,368,488.50
5. Step 5: Solve for x
   x = 1,950,368,488.50/42,890.89
6. Step 6: Final answer
   x = 45,472.79