Finding the Fourth Proportional to 42,485.58, 63,749.79 and 30,085.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,485.58 : 63,749.79 = 30,085.29 : x
2. Step 2: Convert to fraction form
   42,485.58/63,749.79 = 30,085.29/x
3. Step 3: Cross multiply
   42,485.58x = 63,749.79 × 30,085.29
4. Step 4: Simplify right side
   42,485.58x = 1,917,930,919.59
5. Step 5: Solve for x
   x = 1,917,930,919.59/42,485.58
6. Step 6: Final answer
   x = 45,143.10