Finding the Fourth Proportional to 20,434,947.22, 28,214,634.18 and 13,111,646.50

Step by Step Solution

1. Step 1: Write the proportion equation
   20,434,947.22 : 28,214,634.18 = 13,111,646.50 : x
2. Step 2: Convert to fraction form
   20,434,947.22/28,214,634.18 = 13,111,646.50/x
3. Step 3: Cross multiply
   20,434,947.22x = 28,214,634.18 × 13,111,646.50
4. Step 4: Simplify right side
   20,434,947.22x = 369,940,309,494,977.38
5. Step 5: Solve for x
   x = 369,940,309,494,977.38/20,434,947.22
6. Step 6: Final answer
   x = 18,103,316.12