Finding the Fourth Proportional to 64,690.20, 89,269.56 and 39,196.26

Step by Step Solution

1. Step 1: Write the proportion equation
   64,690.20 : 89,269.56 = 39,196.26 : x
2. Step 2: Convert to fraction form
   64,690.20/89,269.56 = 39,196.26/x
3. Step 3: Cross multiply
   64,690.20x = 89,269.56 × 39,196.26
4. Step 4: Simplify right side
   64,690.20x = 3,499,032,883.85
5. Step 5: Solve for x
   x = 3,499,032,883.85/64,690.20
6. Step 6: Final answer
   x = 54,089.07