Finding the Fourth Proportional to 72,103.32, 99,504.59 and 39,840.02

Step by Step Solution

1. Step 1: Write the proportion equation
   72,103.32 : 99,504.59 = 39,840.02 : x
2. Step 2: Convert to fraction form
   72,103.32/99,504.59 = 39,840.02/x
3. Step 3: Cross multiply
   72,103.32x = 99,504.59 × 39,840.02
4. Step 4: Simplify right side
   72,103.32x = 3,964,264,332.77
5. Step 5: Solve for x
   x = 3,964,264,332.77/72,103.32
6. Step 6: Final answer
   x = 54,980.33