Finding the Fourth Proportional to 12,787,288.51, 19,087,649.89 and 11,173,020.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,787,288.51 : 19,087,649.89 = 11,173,020.07 : x
2. Step 2: Convert to fraction form
   12,787,288.51/19,087,649.89 = 11,173,020.07/x
3. Step 3: Cross multiply
   12,787,288.51x = 19,087,649.89 × 11,173,020.07
4. Step 4: Simplify right side
   12,787,288.51x = 213,266,695,310,103.31
5. Step 5: Solve for x
   x = 213,266,695,310,103.31/12,787,288.51
6. Step 6: Final answer
   x = 16,678,023.27