Finding the Fourth Proportional to 71,803.97, 99,089.43 and 39,980.38

Step by Step Solution

1. Step 1: Write the proportion equation
   71,803.97 : 99,089.43 = 39,980.38 : x
2. Step 2: Convert to fraction form
   71,803.97/99,089.43 = 39,980.38/x
3. Step 3: Cross multiply
   71,803.97x = 99,089.43 × 39,980.38
4. Step 4: Simplify right side
   71,803.97x = 3,961,633,065.38
5. Step 5: Solve for x
   x = 3,961,633,065.38/71,803.97
6. Step 6: Final answer
   x = 55,172.90