Finding the Fourth Proportional to 385,561,051.39, 532,059,327.88 and 209,345,013.55

Step by Step Solution

1. Step 1: Write the proportion equation
   385,561,051.39 : 532,059,327.88 = 209,345,013.55 : x
2. Step 2: Convert to fraction form
   385,561,051.39/532,059,327.88 = 209,345,013.55/x
3. Step 3: Cross multiply
   385,561,051.39x = 532,059,327.88 × 209,345,013.55
4. Step 4: Simplify right side
   385,561,051.39x = 111,383,967,204,442,496
5. Step 5: Solve for x
   x = 111,383,967,204,442,496/385,561,051.39
6. Step 6: Final answer
   x = 288,888,016.06