Finding the Fourth Proportional to 510,957.05, 705,086.98 and 306,886.71

Step by Step Solution

1. Step 1: Write the proportion equation
   510,957.05 : 705,086.98 = 306,886.71 : x
2. Step 2: Convert to fraction form
   510,957.05/705,086.98 = 306,886.71/x
3. Step 3: Cross multiply
   510,957.05x = 705,086.98 × 306,886.71
4. Step 4: Simplify right side
   510,957.05x = 216,381,822,788.82
5. Step 5: Solve for x
   x = 216,381,822,788.82/510,957.05
6. Step 6: Final answer
   x = 423,483.39