Finding the Fourth Proportional to 715,106.75, 1,073,112.17 and 399,770.51

Step by Step Solution

1. Step 1: Write the proportion equation
   715,106.75 : 1,073,112.17 = 399,770.51 : x
2. Step 2: Convert to fraction form
   715,106.75/1,073,112.17 = 399,770.51/x
3. Step 3: Cross multiply
   715,106.75x = 1,073,112.17 × 399,770.51
4. Step 4: Simplify right side
   715,106.75x = 428,998,592,123.69
5. Step 5: Solve for x
   x = 428,998,592,123.69/715,106.75
6. Step 6: Final answer
   x = 599,908.47