Finding the Fourth Proportional to 72,191.64, 99,621.59 and 39,924.17

Step by Step Solution

1. Step 1: Write the proportion equation
   72,191.64 : 99,621.59 = 39,924.17 : x
2. Step 2: Convert to fraction form
   72,191.64/99,621.59 = 39,924.17/x
3. Step 3: Cross multiply
   72,191.64x = 99,621.59 × 39,924.17
4. Step 4: Simplify right side
   72,191.64x = 3,977,309,294.83
5. Step 5: Solve for x
   x = 3,977,309,294.83/72,191.64
6. Step 6: Final answer
   x = 55,093.77