Finding the Fourth Proportional to 816,978.65, 1,225,476.89 and 248,452.21

Step by Step Solution

1. Step 1: Write the proportion equation
   816,978.65 : 1,225,476.89 = 248,452.21 : x
2. Step 2: Convert to fraction form
   816,978.65/1,225,476.89 = 248,452.21/x
3. Step 3: Cross multiply
   816,978.65x = 1,225,476.89 × 248,452.21
4. Step 4: Simplify right side
   816,978.65x = 304,472,434,254.78
5. Step 5: Solve for x
   x = 304,472,434,254.78/816,978.65
6. Step 6: Final answer
   x = 372,681.02