Finding the Fourth Proportional to 89,387.10, 134,109.78 and 42,633.90

Step by Step Solution

1. Step 1: Write the proportion equation
   89,387.10 : 134,109.78 = 42,633.90 : x
2. Step 2: Convert to fraction form
   89,387.10/134,109.78 = 42,633.90/x
3. Step 3: Cross multiply
   89,387.10x = 134,109.78 × 42,633.90
4. Step 4: Simplify right side
   89,387.10x = 5,717,622,949.54
5. Step 5: Solve for x
   x = 5,717,622,949.54/89,387.10
6. Step 6: Final answer
   x = 63,964.74