Finding the Fourth Proportional to 71,802.03, 99,086.76 and 39,978.45

Step by Step Solution

1. Step 1: Write the proportion equation
   71,802.03 : 99,086.76 = 39,978.45 : x
2. Step 2: Convert to fraction form
   71,802.03/99,086.76 = 39,978.45/x
3. Step 3: Cross multiply
   71,802.03x = 99,086.76 × 39,978.45
4. Step 4: Simplify right side
   71,802.03x = 3,961,335,080.32
5. Step 5: Solve for x
   x = 3,961,335,080.32/71,802.03
6. Step 6: Final answer
   x = 55,170.24