Finding the Fourth Proportional to 389,423,826.72, 537,383,590.38 and 213,177,726.54

Step by Step Solution

1. Step 1: Write the proportion equation
   389,423,826.72 : 537,383,590.38 = 213,177,726.54 : x
2. Step 2: Convert to fraction form
   389,423,826.72/537,383,590.38 = 213,177,726.54/x
3. Step 3: Cross multiply
   389,423,826.72x = 537,383,590.38 × 213,177,726.54
4. Step 4: Simplify right side
   389,423,826.72x = 114,558,212,077,111,008
5. Step 5: Solve for x
   x = 114,558,212,077,111,008/389,423,826.72
6. Step 6: Final answer
   x = 294,173,607.82