Finding the Fourth Proportional to 705,695.42, 973,789.34 and 399,710.72

Step by Step Solution

1. Step 1: Write the proportion equation
   705,695.42 : 973,789.34 = 399,710.72 : x
2. Step 2: Convert to fraction form
   705,695.42/973,789.34 = 399,710.72/x
3. Step 3: Cross multiply
   705,695.42x = 973,789.34 × 399,710.72
4. Step 4: Simplify right side
   705,695.42x = 389,234,038,219.73
5. Step 5: Solve for x
   x = 389,234,038,219.73/705,695.42
6. Step 6: Final answer
   x = 551,560.95