Finding the Fourth Proportional to 71,699.07, 98,946.56 and 39,870.02

Step by Step Solution

1. Step 1: Write the proportion equation
   71,699.07 : 98,946.56 = 39,870.02 : x
2. Step 2: Convert to fraction form
   71,699.07/98,946.56 = 39,870.02/x
3. Step 3: Cross multiply
   71,699.07x = 98,946.56 × 39,870.02
4. Step 4: Simplify right side
   71,699.07x = 3,945,001,673.17
5. Step 5: Solve for x
   x = 3,945,001,673.17/71,699.07
6. Step 6: Final answer
   x = 55,021.65