Finding the Fourth Proportional to 920,086.67, 1,269,630.54 and 678,499.31

Step by Step Solution

1. Step 1: Write the proportion equation
   920,086.67 : 1,269,630.54 = 678,499.31 : x
2. Step 2: Convert to fraction form
   920,086.67/1,269,630.54 = 678,499.31/x
3. Step 3: Cross multiply
   920,086.67x = 1,269,630.54 × 678,499.31
4. Step 4: Simplify right side
   920,086.67x = 861,443,438,996.78
5. Step 5: Solve for x
   x = 861,443,438,996.78/920,086.67
6. Step 6: Final answer
   x = 936,263.37