Finding the Fourth Proportional to 21,064,284.66, 29,066,673.24 and 13,221,289.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064,284.66 : 29,066,673.24 = 13,221,289.86 : x
2. Step 2: Convert to fraction form
   21,064,284.66/29,066,673.24 = 13,221,289.86/x
3. Step 3: Cross multiply
   21,064,284.66x = 29,066,673.24 × 13,221,289.86
4. Step 4: Simplify right side
   21,064,284.66x = 384,298,912,171,945.31
5. Step 5: Solve for x
   x = 384,298,912,171,945.31/21,064,284.66
6. Step 6: Final answer
   x = 18,244,099.83