Finding the Fourth Proportional to 21,139,091.40, 29,170,164.42 and 11,720,133.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,139,091.40 : 29,170,164.42 = 11,720,133.72 : x
2. Step 2: Convert to fraction form
   21,139,091.40/29,170,164.42 = 11,720,133.72/x
3. Step 3: Cross multiply
   21,139,091.40x = 29,170,164.42 × 11,720,133.72
4. Step 4: Simplify right side
   21,139,091.40x = 341,878,227,636,786.31
5. Step 5: Solve for x
   x = 341,878,227,636,786.31/21,139,091.40
6. Step 6: Final answer
   x = 16,172,796.70