Finding the Third Proportional to 423,144 and 618,505.88

Step by Step Solution

1. Step 1: Write the proportion equation
   423,144 : 618,505.88 = 618,505.88 : x
2. Step 2: Convert to fraction form
   423,144/618,505.88 = 618,505.88/x
3. Step 3: Cross multiply
   423,144x = 618,505.88 × 618,505.88
4. Step 4: Simplify right side
   423,144x = 382,549,517,409.52
5. Step 5: Solve for x
   x = 382,549,517,409.52/423,144
6. Step 6: Final answer
   x = 904,064.61