Finding the Fourth Proportional to 21,021,009.91, 29,009,371.53 and 12,321,648.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,021,009.91 : 29,009,371.53 = 12,321,648.79 : x
2. Step 2: Convert to fraction form
   21,021,009.91/29,009,371.53 = 12,321,648.79/x
3. Step 3: Cross multiply
   21,021,009.91x = 29,009,371.53 × 12,321,648.79
4. Step 4: Simplify right side
   21,021,009.91x = 357,443,287,611,284.94
5. Step 5: Solve for x
   x = 357,443,287,611,284.94/21,021,009.91
6. Step 6: Final answer
   x = 17,004,096.81