Finding the Fourth Proportional to 13,139,145.68, 18,000,328.39 and 12,647,908.11

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139,145.68 : 18,000,328.39 = 12,647,908.11 : x
2. Step 2: Convert to fraction form
   13,139,145.68/18,000,328.39 = 12,647,908.11/x
3. Step 3: Cross multiply
   13,139,145.68x = 18,000,328.39 × 12,647,908.11
4. Step 4: Simplify right side
   13,139,145.68x = 227,666,499,368,162.34
5. Step 5: Solve for x
   x = 227,666,499,368,162.34/13,139,145.68
6. Step 6: Final answer
   x = 17,327,344.18