Finding the Fourth Proportional to 648,855.50, 894,922.83 and 390,463.07

Step by Step Solution

1. Step 1: Write the proportion equation
   648,855.50 : 894,922.83 = 390,463.07 : x
2. Step 2: Convert to fraction form
   648,855.50/894,922.83 = 390,463.07/x
3. Step 3: Cross multiply
   648,855.50x = 894,922.83 × 390,463.07
4. Step 4: Simplify right side
   648,855.50x = 349,434,311,140.27
5. Step 5: Solve for x
   x = 349,434,311,140.27/648,855.50
6. Step 6: Final answer
   x = 538,539.50