Finding the Fourth Proportional to 13,138,215.57, 18,131,288.40 and 7,556,463.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,138,215.57 : 18,131,288.40 = 7,556,463.72 : x
2. Step 2: Convert to fraction form
   13,138,215.57/18,131,288.40 = 7,556,463.72/x
3. Step 3: Cross multiply
   13,138,215.57x = 18,131,288.40 × 7,556,463.72
4. Step 4: Simplify right side
   13,138,215.57x = 137,008,422,991,456.83
5. Step 5: Solve for x
   x = 137,008,422,991,456.83/13,138,215.57
6. Step 6: Final answer
   x = 10,428,236.79