Finding the Fourth Proportional to 858,758.10, 1,200,686.70 and 858,758.10

Step by Step Solution

1. Step 1: Write the proportion equation
   858,758.10 : 1,200,686.70 = 858,758.10 : x
2. Step 2: Convert to fraction form
   858,758.10/1,200,686.70 = 858,758.10/x
3. Step 3: Cross multiply
   858,758.10x = 1,200,686.70 × 858,758.10
4. Step 4: Simplify right side
   858,758.10x = 1,031,099,429,187.27
5. Step 5: Solve for x
   x = 1,031,099,429,187.27/858,758.10
6. Step 6: Final answer
   x = 1,200,686.70