Finding the Fourth Proportional to 21,139,914.09, 29,172,585.27 and 12,438,650.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,139,914.09 : 29,172,585.27 = 12,438,650.28 : x
2. Step 2: Convert to fraction form
   21,139,914.09/29,172,585.27 = 12,438,650.28/x
3. Step 3: Cross multiply
   21,139,914.09x = 29,172,585.27 × 12,438,650.28
4. Step 4: Simplify right side
   21,139,914.09x = 362,867,586,093,051.50
5. Step 5: Solve for x
   x = 362,867,586,093,051.50/21,139,914.09
6. Step 6: Final answer
   x = 17,165,045.44