Finding the Fourth Proportional to 70,209.72, 96,884.82 and 39,990.60

Step by Step Solution

1. Step 1: Write the proportion equation
   70,209.72 : 96,884.82 = 39,990.60 : x
2. Step 2: Convert to fraction form
   70,209.72/96,884.82 = 39,990.60/x
3. Step 3: Cross multiply
   70,209.72x = 96,884.82 × 39,990.60
4. Step 4: Simplify right side
   70,209.72x = 3,874,482,082.69
5. Step 5: Solve for x
   x = 3,874,482,082.69/70,209.72
6. Step 6: Final answer
   x = 55,184.41