Finding the Fourth Proportional to 72,405.82, 99,918.61 and 39,699.84

Step by Step Solution

1. Step 1: Write the proportion equation
   72,405.82 : 99,918.61 = 39,699.84 : x
2. Step 2: Convert to fraction form
   72,405.82/99,918.61 = 39,699.84/x
3. Step 3: Cross multiply
   72,405.82x = 99,918.61 × 39,699.84
4. Step 4: Simplify right side
   72,405.82x = 3,966,752,830.02
5. Step 5: Solve for x
   x = 3,966,752,830.02/72,405.82
6. Step 6: Final answer
   x = 54,785.00