Finding the Fourth Proportional to 546,300.90, 819,062.55 and 209,211.30

Step by Step Solution

1. Step 1: Write the proportion equation
   546,300.90 : 819,062.55 = 209,211.30 : x
2. Step 2: Convert to fraction form
   546,300.90/819,062.55 = 209,211.30/x
3. Step 3: Cross multiply
   546,300.90x = 819,062.55 × 209,211.30
4. Step 4: Simplify right side
   546,300.90x = 171,357,140,866.82
5. Step 5: Solve for x
   x = 171,357,140,866.82/546,300.90
6. Step 6: Final answer
   x = 313,668.06