Finding the Fourth Proportional to 72,111.48, 99,515.86 and 39,848.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72,111.48 : 99,515.86 = 39,848.18 : x
2. Step 2: Convert to fraction form
   72,111.48/99,515.86 = 39,848.18/x
3. Step 3: Cross multiply
   72,111.48x = 99,515.86 × 39,848.18
4. Step 4: Simplify right side
   72,111.48x = 3,965,525,902.13
5. Step 5: Solve for x
   x = 3,965,525,902.13/72,111.48
6. Step 6: Final answer
   x = 54,991.60