Finding the Fourth Proportional to 359,196.71, 537,979.46 and 278,587.61

Step by Step Solution

1. Step 1: Write the proportion equation
   359,196.71 : 537,979.46 = 278,587.61 : x
2. Step 2: Convert to fraction form
   359,196.71/537,979.46 = 278,587.61/x
3. Step 3: Cross multiply
   359,196.71x = 537,979.46 × 278,587.61
4. Step 4: Simplify right side
   359,196.71x = 149,874,410,597.55
5. Step 5: Solve for x
   x = 149,874,410,597.55/359,196.71
6. Step 6: Final answer
   x = 417,248.84