Finding the Fourth Proportional to 21,049,809.36, 29,047,917 and 13,213,536.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,049,809.36 : 29,047,917 = 13,213,536.72 : x
2. Step 2: Convert to fraction form
   21,049,809.36/29,047,917 = 13,213,536.72/x
3. Step 3: Cross multiply
   21,049,809.36x = 29,047,917 × 13,213,536.72
4. Step 4: Simplify right side
   21,049,809.36x = 383,825,717,919,012.25
5. Step 5: Solve for x
   x = 383,825,717,919,012.25/21,049,809.36
6. Step 6: Final answer
   x = 18,234,165.99