Finding the Fourth Proportional to 72,178.17, 99,597.18 and 39,908.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,178.17 : 99,597.18 = 39,908.40 : x
2. Step 2: Convert to fraction form
   72,178.17/99,597.18 = 39,908.40/x
3. Step 3: Cross multiply
   72,178.17x = 99,597.18 × 39,908.40
4. Step 4: Simplify right side
   72,178.17x = 3,974,764,098.31
5. Step 5: Solve for x
   x = 3,974,764,098.31/72,178.17
6. Step 6: Final answer
   x = 55,068.78