Finding the Fourth Proportional to 978,238.70, 1,372,022.50 and 978,238.70

Step by Step Solution

1. Step 1: Write the proportion equation
   978,238.70 : 1,372,022.50 = 978,238.70 : x
2. Step 2: Convert to fraction form
   978,238.70/1,372,022.50 = 978,238.70/x
3. Step 3: Cross multiply
   978,238.70x = 1,372,022.50 × 978,238.70
4. Step 4: Simplify right side
   978,238.70x = 1,342,165,506,770.75
5. Step 5: Solve for x
   x = 1,342,165,506,770.75/978,238.70
6. Step 6: Final answer
   x = 1,372,022.50