Finding the Fourth Proportional to 120,103.59, 165,719.40 and 72,359.55

Step by Step Solution

1. Step 1: Write the proportion equation
   120,103.59 : 165,719.40 = 72,359.55 : x
2. Step 2: Convert to fraction form
   120,103.59/165,719.40 = 72,359.55/x
3. Step 3: Cross multiply
   120,103.59x = 165,719.40 × 72,359.55
4. Step 4: Simplify right side
   120,103.59x = 11,991,381,210.27
5. Step 5: Solve for x
   x = 11,991,381,210.27/120,103.59
6. Step 6: Final answer
   x = 99,841.99