Finding the Fourth Proportional to 72,185.04, 99,611.91 and 39,918.42

Step by Step Solution

1. Step 1: Write the proportion equation
   72,185.04 : 99,611.91 = 39,918.42 : x
2. Step 2: Convert to fraction form
   72,185.04/99,611.91 = 39,918.42/x
3. Step 3: Cross multiply
   72,185.04x = 99,611.91 × 39,918.42
4. Step 4: Simplify right side
   72,185.04x = 3,976,350,060.38
5. Step 5: Solve for x
   x = 3,976,350,060.38/72,185.04
6. Step 6: Final answer
   x = 55,085.51