Finding the Fourth Proportional to 13,139,020.19, 18,000,156.78 and 12,647,782.73

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139,020.19 : 18,000,156.78 = 12,647,782.73 : x
2. Step 2: Convert to fraction form
   13,139,020.19/18,000,156.78 = 12,647,782.73/x
3. Step 3: Cross multiply
   13,139,020.19x = 18,000,156.78 × 12,647,782.73
4. Step 4: Simplify right side
   13,139,020.19x = 227,662,071,969,375.62
5. Step 5: Solve for x
   x = 227,662,071,969,375.62/13,139,020.19
6. Step 6: Final answer
   x = 17,327,172.71