Finding the Fourth Proportional to 978,128.70, 1,367,721.30 and 978,128.70

Step by Step Solution

1. Step 1: Write the proportion equation
   978,128.70 : 1,367,721.30 = 978,128.70 : x
2. Step 2: Convert to fraction form
   978,128.70/1,367,721.30 = 978,128.70/x
3. Step 3: Cross multiply
   978,128.70x = 1,367,721.30 × 978,128.70
4. Step 4: Simplify right side
   978,128.70x = 1,337,807,457,131.31
5. Step 5: Solve for x
   x = 1,337,807,457,131.31/978,128.70
6. Step 6: Final answer
   x = 1,367,721.30