Finding the Fourth Proportional to 1,399.72, 1,934.12 and 1,006.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.72 : 1,934.12 = 1,006.06 : x
2. Step 2: Convert to fraction form
   1,399.72/1,934.12 = 1,006.06/x
3. Step 3: Cross multiply
   1,399.72x = 1,934.12 × 1,006.06
4. Step 4: Simplify right side
   1,399.72x = 1,945,840.77
5. Step 5: Solve for x
   x = 1,945,840.77/1,399.72
6. Step 6: Final answer
   x = 1,390.16