Finding the Fourth Proportional to 564,131.76, 778,488.30 and 309,480.72

Step by Step Solution

1. Step 1: Write the proportion equation
   564,131.76 : 778,488.30 = 309,480.72 : x
2. Step 2: Convert to fraction form
   564,131.76/778,488.30 = 309,480.72/x
3. Step 3: Cross multiply
   564,131.76x = 778,488.30 × 309,480.72
4. Step 4: Simplify right side
   564,131.76x = 240,927,119,595.58
5. Step 5: Solve for x
   x = 240,927,119,595.58/564,131.76
6. Step 6: Final answer
   x = 427,075.97