Finding the Fourth Proportional to 451,863.08, 623,059.72 and 288,300.72

Step by Step Solution

1. Step 1: Write the proportion equation
   451,863.08 : 623,059.72 = 288,300.72 : x
2. Step 2: Convert to fraction form
   451,863.08/623,059.72 = 288,300.72/x
3. Step 3: Cross multiply
   451,863.08x = 623,059.72 × 288,300.72
4. Step 4: Simplify right side
   451,863.08x = 179,628,565,879.00
5. Step 5: Solve for x
   x = 179,628,565,879.00/451,863.08
6. Step 6: Final answer
   x = 397,528.75