Finding the Fourth Proportional to 645,782.72, 891,184.56 and 359,314.88

Step by Step Solution

1. Step 1: Write the proportion equation
   645,782.72 : 891,184.56 = 359,314.88 : x
2. Step 2: Convert to fraction form
   645,782.72/891,184.56 = 359,314.88/x
3. Step 3: Cross multiply
   645,782.72x = 891,184.56 × 359,314.88
4. Step 4: Simplify right side
   645,782.72x = 320,215,873,234.25
5. Step 5: Solve for x
   x = 320,215,873,234.25/645,782.72
6. Step 6: Final answer
   x = 495,856.99