Finding the Fourth Proportional to 1,074,378.72, 1,611,337.68 and 443,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,074,378.72 : 1,611,337.68 = 443,128.80 : x
2. Step 2: Convert to fraction form
   1,074,378.72/1,611,337.68 = 443,128.80/x
3. Step 3: Cross multiply
   1,074,378.72x = 1,611,337.68 × 443,128.80
4. Step 4: Simplify right side
   1,074,378.72x = 714,030,132,533.18
5. Step 5: Solve for x
   x = 714,030,132,533.18/1,074,378.72
6. Step 6: Final answer
   x = 664,598.17