Finding the Fourth Proportional to 1,379.91, 1,908.72 and 1,158.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.91 : 1,908.72 = 1,158.51 : x
2. Step 2: Convert to fraction form
   1,379.91/1,908.72 = 1,158.51/x
3. Step 3: Cross multiply
   1,379.91x = 1,908.72 × 1,158.51
4. Step 4: Simplify right side
   1,379.91x = 2,211,271.21
5. Step 5: Solve for x
   x = 2,211,271.21/1,379.91
6. Step 6: Final answer
   x = 1,602.47