Finding the Fourth Proportional to 705,388.91, 973,496.73 and 399,519.69

Step by Step Solution

1. Step 1: Write the proportion equation
   705,388.91 : 973,496.73 = 399,519.69 : x
2. Step 2: Convert to fraction form
   705,388.91/973,496.73 = 399,519.69/x
3. Step 3: Cross multiply
   705,388.91x = 973,496.73 × 399,519.69
4. Step 4: Simplify right side
   705,388.91x = 388,931,112,861.82
5. Step 5: Solve for x
   x = 388,931,112,861.82/705,388.91
6. Step 6: Final answer
   x = 551,371.18