Finding the Fourth Proportional to 72,175.81, 99,598.56 and 39,908.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72,175.81 : 99,598.56 = 39,908.55 : x
2. Step 2: Convert to fraction form
   72,175.81/99,598.56 = 39,908.55/x
3. Step 3: Cross multiply
   72,175.81x = 99,598.56 × 39,908.55
4. Step 4: Simplify right side
   72,175.81x = 3,974,834,111.69
5. Step 5: Solve for x
   x = 3,974,834,111.69/72,175.81
6. Step 6: Final answer
   x = 55,071.56