Finding the Fourth Proportional to 381,322.89, 526,215.59 and 209,240.31

Step by Step Solution

1. Step 1: Write the proportion equation
   381,322.89 : 526,215.59 = 209,240.31 : x
2. Step 2: Convert to fraction form
   381,322.89/526,215.59 = 209,240.31/x
3. Step 3: Cross multiply
   381,322.89x = 526,215.59 × 209,240.31
4. Step 4: Simplify right side
   381,322.89x = 110,105,514,890.19
5. Step 5: Solve for x
   x = 110,105,514,890.19/381,322.89
6. Step 6: Final answer
   x = 288,746.15