Finding the Fourth Proportional to 12,018,457.91, 18,045,696.81 and 10,404,205.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,018,457.91 : 18,045,696.81 = 10,404,205.87 : x
2. Step 2: Convert to fraction form
   12,018,457.91/18,045,696.81 = 10,404,205.87/x
3. Step 3: Cross multiply
   12,018,457.91x = 18,045,696.81 × 10,404,205.87
4. Step 4: Simplify right side
   12,018,457.91x = 187,751,144,618,788.78
5. Step 5: Solve for x
   x = 187,751,144,618,788.78/12,018,457.91
6. Step 6: Final answer
   x = 15,621,899.75