Finding the Fourth Proportional to 21,667,197, 29,900,736.18 and 12,009,405

Step by Step Solution

1. Step 1: Write the proportion equation
   21,667,197 : 29,900,736.18 = 12,009,405 : x
2. Step 2: Convert to fraction form
   21,667,197/29,900,736.18 = 12,009,405/x
3. Step 3: Cross multiply
   21,667,197x = 29,900,736.18 × 12,009,405
4. Step 4: Simplify right side
   21,667,197x = 359,090,050,583,772.88
5. Step 5: Solve for x
   x = 359,090,050,583,772.88/21,667,197
6. Step 6: Final answer
   x = 16,572,981.29