Finding the Fourth Proportional to 1,039,725.41, 1,559,736.89 and 320,128.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039,725.41 : 1,559,736.89 = 320,128.00 : x
2. Step 2: Convert to fraction form
   1,039,725.41/1,559,736.89 = 320,128.00/x
3. Step 3: Cross multiply
   1,039,725.41x = 1,559,736.89 × 320,128.00
4. Step 4: Simplify right side
   1,039,725.41x = 499,315,445,922.06
5. Step 5: Solve for x
   x = 499,315,445,922.06/1,039,725.41
6. Step 6: Final answer
   x = 480,237.80