Finding the Fourth Proportional to 117,428.72, 162,080.46 and 72,117.50

Step by Step Solution

1. Step 1: Write the proportion equation
   117,428.72 : 162,080.46 = 72,117.50 : x
2. Step 2: Convert to fraction form
   117,428.72/162,080.46 = 72,117.50/x
3. Step 3: Cross multiply
   117,428.72x = 162,080.46 × 72,117.50
4. Step 4: Simplify right side
   117,428.72x = 11,688,837,574.05
5. Step 5: Solve for x
   x = 11,688,837,574.05/117,428.72
6. Step 6: Final answer
   x = 99,539.85