Finding the Fourth Proportional to 980,834.81, 1,354,106.99 and 636,978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   980,834.81 : 1,354,106.99 = 636,978.27 : x
2. Step 2: Convert to fraction form
   980,834.81/1,354,106.99 = 636,978.27/x
3. Step 3: Cross multiply
   980,834.81x = 1,354,106.99 × 636,978.27
4. Step 4: Simplify right side
   980,834.81x = 862,536,729,477.55
5. Step 5: Solve for x
   x = 862,536,729,477.55/980,834.81
6. Step 6: Final answer
   x = 879,390.41