Finding the Fourth Proportional to 526,784.50, 726,962.61 and 288,320.50

Step by Step Solution

1. Step 1: Write the proportion equation
   526,784.50 : 726,962.61 = 288,320.50 : x
2. Step 2: Convert to fraction form
   526,784.50/726,962.61 = 288,320.50/x
3. Step 3: Cross multiply
   526,784.50x = 726,962.61 × 288,320.50
4. Step 4: Simplify right side
   526,784.50x = 209,598,223,196.51
5. Step 5: Solve for x
   x = 209,598,223,196.51/526,784.50
6. Step 6: Final answer
   x = 397,882.29