Finding the Fourth Proportional to 1,351.98, 1,861.65 and 1,155.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.98 : 1,861.65 = 1,155.06 : x
2. Step 2: Convert to fraction form
   1,351.98/1,861.65 = 1,155.06/x
3. Step 3: Cross multiply
   1,351.98x = 1,861.65 × 1,155.06
4. Step 4: Simplify right side
   1,351.98x = 2,150,317.45
5. Step 5: Solve for x
   x = 2,150,317.45/1,351.98
6. Step 6: Final answer
   x = 1,590.50