Finding the Fourth Proportional to 70,185.31, 96,861.48 and 39,980.09

Step by Step Solution

1. Step 1: Write the proportion equation
   70,185.31 : 96,861.48 = 39,980.09 : x
2. Step 2: Convert to fraction form
   70,185.31/96,861.48 = 39,980.09/x
3. Step 3: Cross multiply
   70,185.31x = 96,861.48 × 39,980.09
4. Step 4: Simplify right side
   70,185.31x = 3,872,530,687.93
5. Step 5: Solve for x
   x = 3,872,530,687.93/70,185.31
6. Step 6: Final answer
   x = 55,175.80