Finding the Third Proportional to 145,591.59 and 311,423.91

Step by Step Solution

1. Step 1: Write the proportion equation
   145,591.59 : 311,423.91 = 311,423.91 : x
2. Step 2: Convert to fraction form
   145,591.59/311,423.91 = 311,423.91/x
3. Step 3: Cross multiply
   145,591.59x = 311,423.91 × 311,423.91
4. Step 4: Simplify right side
   145,591.59x = 96,984,849,384.01
5. Step 5: Solve for x
   x = 96,984,849,384.01/145,591.59
6. Step 6: Final answer
   x = 666,143.19