Finding the Fourth Proportional to 85,404.50, 128,184.49 and 45,457.02

Step by Step Solution

1. Step 1: Write the proportion equation
   85,404.50 : 128,184.49 = 45,457.02 : x
2. Step 2: Convert to fraction form
   85,404.50/128,184.49 = 45,457.02/x
3. Step 3: Cross multiply
   85,404.50x = 128,184.49 × 45,457.02
4. Step 4: Simplify right side
   85,404.50x = 5,826,884,811.98
5. Step 5: Solve for x
   x = 5,826,884,811.98/85,404.50
6. Step 6: Final answer
   x = 68,226.91