Finding the Fourth Proportional to 564,128.76, 778,484.16 and 309,477.72

Step by Step Solution

1. Step 1: Write the proportion equation
   564,128.76 : 778,484.16 = 309,477.72 : x
2. Step 2: Convert to fraction form
   564,128.76/778,484.16 = 309,477.72/x
3. Step 3: Cross multiply
   564,128.76x = 778,484.16 × 309,477.72
4. Step 4: Simplify right side
   564,128.76x = 240,923,502,892.92
5. Step 5: Solve for x
   x = 240,923,502,892.92/564,128.76
6. Step 6: Final answer
   x = 427,071.83