Finding the Fourth Proportional to 13,209,747.30, 19,783,128.15 and 13,209,747.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,209,747.30 : 19,783,128.15 = 13,209,747.30 : x
2. Step 2: Convert to fraction form
   13,209,747.30/19,783,128.15 = 13,209,747.30/x
3. Step 3: Cross multiply
   13,209,747.30x = 19,783,128.15 × 13,209,747.30
4. Step 4: Simplify right side
   13,209,747.30x = 261,330,123,665,016.50
5. Step 5: Solve for x
   x = 261,330,123,665,016.50/13,209,747.30
6. Step 6: Final answer
   x = 19,783,128.15