Finding the Fourth Proportional to 71,707.58, 98,946.86 and 39,870.35

Step by Step Solution

1. Step 1: Write the proportion equation
   71,707.58 : 98,946.86 = 39,870.35 : x
2. Step 2: Convert to fraction form
   71,707.58/98,946.86 = 39,870.35/x
3. Step 3: Cross multiply
   71,707.58x = 98,946.86 × 39,870.35
4. Step 4: Simplify right side
   71,707.58x = 3,945,045,245.51
5. Step 5: Solve for x
   x = 3,945,045,245.51/71,707.58
6. Step 6: Final answer
   x = 55,015.74