Finding the Fourth Proportional to 666,019.62, 918,493.63 and 436,493.30

Step by Step Solution

1. Step 1: Write the proportion equation
   666,019.62 : 918,493.63 = 436,493.30 : x
2. Step 2: Convert to fraction form
   666,019.62/918,493.63 = 436,493.30/x
3. Step 3: Cross multiply
   666,019.62x = 918,493.63 × 436,493.30
4. Step 4: Simplify right side
   666,019.62x = 400,916,309,903.98
5. Step 5: Solve for x
   x = 400,916,309,903.98/666,019.62
6. Step 6: Final answer
   x = 601,958.71