Finding the Fourth Proportional to 21,181,914.69, 29,139,314.49 and 18,556,596.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,181,914.69 : 29,139,314.49 = 18,556,596.15 : x
2. Step 2: Convert to fraction form
   21,181,914.69/29,139,314.49 = 18,556,596.15/x
3. Step 3: Cross multiply
   21,181,914.69x = 29,139,314.49 × 18,556,596.15
4. Step 4: Simplify right side
   21,181,914.69x = 540,726,491,078,773.12
5. Step 5: Solve for x
   x = 540,726,491,078,773.12/21,181,914.69
6. Step 6: Final answer
   x = 25,527,743.78